# List of state highways in Maryland

Maryland has an extensive system of state highways, exclusive of the national Interstate and U.S. highway systems, that serves all 23 counties and the independent city of Baltimore, almost every incorporated city, town, and village, and most unincorporated places in the state. These highways are each designated Maryland Route X, where X is a number between 2 and 999. The highways are typically abbreviated MD X, although MD Route X and Route X are used less frequently. Because Maryland does not have a secondary route system or signed county route systems, all state highways are part of the main numerical system. That means the same set of numbers is used for both major highways and minor service roads, and almost every number has been used at one time or another.
The Maryland State Highway Administration constructs and maintains the vast majority of state highways in the 23 counties of Maryland. The Baltimore City Department of Transportation maintains all state highways within the city of Baltimore. Several towns and cities also maintain all or parts of the state highways within their boundaries. There are a few instances where a county department of transportation maintains sections of a state highway. Two unique situations are that MD 200 is maintained by the Maryland Transportation Authority, which controls all of the publicly owned, tolled highways and bridges in the state, and part of MD 295, also known as the Baltimore–Washington Parkway, is maintained by the National Park Service as a National Parkway.
Maryland applies letter suffixes to route numbers as a way of organizing groups of related highways, such as a group of old alignments of a major highway, a group of service roads related to the construction of a major highway, or a combination of both. However, these letter suffixes are only used for inventory purposes and are never signed, with the exception of MD 835A. Since most routes with suffixes are very short highways of low importance, these highways are rarely signed with route markers. However, there are several numbered highways with several disjoint segments whose segments are denoted internally with letter suffixes but the segments are signed with the same numerical route marker; examples of these highways include MD 7, MD 18, MD 144, MD 648, MD 675, and MD 765.
There is no duplication allowed between U.S. and Maryland state highways unless the two highways are related. The only signed example of duplicate numbers is MD 222, which is the old alignment of US 222 before the latter was rolled back from Perryville to Conowingo. Duplication of number is allowed between Interstate and Maryland state highways. MD 795 is an unsigned short continuation of I-795. Also, MD 68 intersects I-70 in close proximity to I-68 that signs are posted on I-70 advising drivers of the difference between the roads.
This list of Maryland state highways contains all existing state highways—that is, all highways with Maryland route numbers—and all documented former state highways.
| Number | Length (mi) | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
| MD 2 | 79.24 | 127.52 | Solomons | US 1 in Baltimore | 01927-01-011927 | current | |
| MD 3 | 9.56 | 15.39 | US 50 / US 301 in Bowie | I-97 in Millersville | 01927-01-011927 | current | |
| MD 4 | 64.85 | 104.37 | MD 5 in Leonardtown | Pennsylvania Avenue in Washington, D.C. | 01927-01-011927 | current | |
| MD 5 | 74.34 | 119.64 | Point Lookout | Branch Avenue in Washington, D.C. | 01927-01-011927 | current | |
| MD 6 | 47.38 | 76.25 | Riverside | MD 235 in Oraville | 01927-01-011927 | current | |
| MD 7 | 22.83 | 36.74 | US 40 in Rosedale | US 40 / MD 159 in Aberdeen | 01938-01-011938 | current | Longest section |
| MD 8 | 8.37 | 13.47 | Romancoke | MD 18 in Stevensville | 01960-01-011960 | current | |
| MD 9 | — | — | — | — | 01978-01-011978 | 01978-01-011978 | proposed renumbering of US 140 west of Reisterstown (now part of MD 140) |
| MD 10 | 7.17 | 11.54 | MD 2 in Pasadena | I-695 in Glen Burnie | 01972-01-011972 | current | |
| MD 12 | 30.57 | 49.20 | VA 679 near Stockton | Main Street in Salisbury | 01927-01-011927 | current | |
| MD 14 | 11.51 | 18.52 | MD 16 in Secretary | MD 313 in Eldorado | 01927-01-011927 | current | |
| MD 16 | 50.06 | 80.56 | Taylors Island | DE 16 near Andersontown | 01927-01-011927 | current | |
| MD 17 | 29.49 | 47.46 | VA 287 in Brunswick | Wolfsville | 01940-01-011940 | current | |
| MD 17 | — | — | Claiborne | US 213 in Easton | 01927-01-011927 | 01940-01-011940 | |
| MD 18 | 20.47 | 32.94 | Love Point | MD 213 in Centreville | 01927-01-011927 | current | Contiguous sections |
| MD 19 | 8.60 | 13.84 | MD 213 in Church Hill | MD 313 in Ingleside | 01927-01-011927 | current | |
| MD 20 | 13.77 | 22.16 | Rock Hall | MD 291 in Chestertown | 01927-01-011927 | current | |
| MD 20 | 2.72 | 4.38 | MD 151 in Dundalk | MD 150 in Dundalk | 01927-01-011927 | 01998-01-011998 | Longest section |
| MD 21 | 2.42 | 3.89 | MD 445 near Tolchester Beach | MD 20 near Fairlee | 01927-01-011927 | current | |
| MD 22 | 13.04 | 20.99 | US 1 Business / MD 924 in Bel Air | Aberdeen Proving Ground | 01927-01-011927 | current | |
| MD 23 | 20.46 | 32.93 | US 1 in Hickory | PA 24 near Norrisville | 01927-01-011927 | current | |
| MD 24 | 25.17 | 40.51 | Aberdeen Proving Ground | PA QR 2055 in Fawn Grove, PA | 01927-01-011927 | current | |
| MD 25 | 26.89 | 43.28 | MD 2 in Baltimore | Beckleysville Road near Alesia | 01927-01-011927 | current | |
| MD 26 | 44.10 | 70.97 | US 15 in Frederick | MD 140 in Baltimore | 01927-01-011927 | current | |
| MD 27 | 39.17 | 63.04 | MD 355 in Germantown | MD 30 in Manchester | 01934-01-011934 | current | |
| MD 27 | — | — | Georgia Avenue in Washington, D.C. | US 40 in Ellicott City | 01927-01-011927 | 01934-01-011934 | |
| MD 28 | 37.38 | 60.16 | US 15 in Point of Rocks | MD 182 in Norwood | 01927-01-011927 | current | |
| MD 29 | — | — | US 240 in Germantown | US 140 in Westminster | 01927-01-011927 | 01934-01-011934 | |
| MD 30 | 19.16 | 30.84 | MD 140 in Reisterstown | PA 94 near Manchester | 01927-01-011927 | current | |
| MD 31 | 16.95 | 27.28 | MD 26 in Libertytown | MD 140 in Westminster | 01927-01-011927 | current | |
| MD 32 | 51.79 | 83.35 | I-97 in Millersville | Westminster | 01927-01-011927 | current | |
| MD 33 | 23.17 | 37.29 | Tilghman Island | Washington Street in Easton | 01940-01-011940 | current | |
| MD 33 | — | — | Brunswick | Wolfsville | 01927-01-011927 | 01940-01-011940 | |
| MD 34 | 9.95 | 16.01 | WV 480 near Shepherdstown, WV | US 40 Alternate in Boonsboro | 01927-01-011927 | current | |
| MD 35 | 2.37 | 3.81 | MD 36 in Corriganville | PA 96 in Ellerslie | 01927-01-011927 | current | |
| MD 36 | 29.43 | 47.36 | WV 46 in Westernport | US 40 Alternate in La Vale | 01927-01-011927 | current | |
| MD 37 | — | — | West Virginia state line near Redhouse | US 40 at Keyser's Ridge | 01927-01-011927 | 01935-01-011935 | |
| MD 37 | — | — | Garrison near the Gwynns Falls | Garrison near the Gwynns Falls | 01950-01-011950 | 01998-01-011998 | |
| MD 38 | 5.67 | 9.12 | WV 42 in Kitzmiller | MD 135 near Kitzmiller | 01927-01-011927 | current | |
| MD 39 | 6.22 | 10.01 | WV 7 in Hutton | US 219 in Oakland | 01927-01-011927 | current | |
| MD 41 | 6.75 | 10.86 | MD 147 in Baltimore | Waltham Woods Road in Carney | 01962-01-011962 | current | |
| MD 41 | — | — | US 219 in Oakland | MD 38 in Deer Park | 01927-01-011927 | 01956-01-011956 | |
| MD 42 | 15.06 | 24.24 | US 219 near McHenry | PA QR 2013 in Asher Glade | 01927-01-011927 | current | |
| MD 43 | 8.65 | 13.92 | I-695 in Parkville | MD 150 in Middle River | 01963-01-011963 | current | |
| MD 44 | — | — | Fort Frederick State Park | MD 56 near Big Pool | 01936-01-011936 | 01969-01-011969 | |
| MD 45 | 30.02 | 48.31 | US 1 in Baltimore | PA QR 3001 in Maryland Line | 01957-01-011957 | current | |
| MD 45 | — | — | dead end | US 40 Alternate northwest of Frostburg | 01927-01-011927 | 01956-01-011956 | |
| MD 46 | — | — | MD 295 in Linthicum | BWI Airport | 01950-01-011950 | 01990-01-011990 | |
| MD 47 | 1.70 | 2.74 | MD 36 in Barrelville | PA 160 near Barrelville | 01927-01-011927 | current | |
| MD 48 | — | — | US 220 near Dickens | Pennsylvania state line | 01927-01-011927 | 01950-01-011950 | |
| MD 49 | 2.69 | 4.33 | MD 658 in La Vale | Greene Street in Cumberland | 01927-01-011927 | current | |
| MD 51 | 25.53 | 41.09 | I-68 / US 40 / US 220 in Cumberland | WV 9 near Paw Paw, WV | 01927-01-011927 | current | |
| MD 52 | — | — | MD 51 in Cumberland | Christie Road near Evitts Creek | 01927-01-011927 | 01956-01-011956 | |
| MD 53 | 3.33 | 5.36 | US 220 in Cresaptown | US 40 Alternate in La Vale | 01927-01-011927 | current | |
| MD 54 | 19.79 | 31.85 | MD 313 in Mardela Springs | DE 54 / DE 26 / MD 353 near Gumboro, DE | 01969-01-011969 | current | Length only includes the section of the Maryland and Delaware portions of Route 54 between the Maryland endpoints |
| MD 54 | — | — | MD 17 in Myersville | Easterday Road near Myersville | 01933-01-011933 | 01956-01-011956 | |
| MD 55 | 2.53 | 4.07 | MD 36 in Vale Summit | US 40 Alternate in Clarysville | 01927-01-011927 | current | |
| MD 56 | 8.08 | 13.00 | I-70 in Big Pool | MD 68 near Pinesburg | 01927-01-011927 | current | |
| MD 57 | 4.02 | 6.47 | US 40 near Clear Spring | MD 494 near Fairview | 01927-01-011927 | current | |
| MD 58 | 3.53 | 5.68 | MD 63 in Cearfoss | Hagerstown | 01928-01-011928 | current | |
| MD 59 | — | — | US 340 in Jefferson | US 40 Alternate in Middletown | 01929-01-011929 | 01956-01-011956 | |
| MD 60 | 3.53 | 5.68 | Hagerstown | PA 316 near Leitersburg | 01927-01-011927 | current | |
| MD 61 | 1.94 | 3.12 | WV 28 in Cumberland | MD 51 in Cumberland | 02001-01-012001 | current | |
| MD 61 | — | — | Antietam Drive near Hagerstown | East of Hagerstown | 01927-01-011927 | 01956-01-011956 | |
| MD 62 | 3.88 | 6.24 | MD 804 in Chewsville | MD 60 in Leitersburg | 01927-01-011927 | current | |
| MD 63 | 16.99 | 27.34 | MD 65 near Spielman | PA 163 near Cearfoss | 01927-01-011927 | current | |
| MD 64 | 13.33 | 21.45 | US 40 in Hagerstown | PA 997 near Ringgold | 01927-01-011927 | current | |
| MD 65 | 11.75 | 18.91 | MD 34 in Sharpsburg | Hagerstown | 01927-01-011927 | current | |
| MD 66 | 12.84 | 20.66 | US 40 Alternate in Boonsboro | MD 64 near Smithsburg | 01927-01-011927 | current | |
| MD 67 | 12.20 | 19.63 | US 340 in Weverton | US 40 Alternate in Boonsboro | 01927-01-011927 | current | |
| MD 68 | 18.50 | 29.77 | US 40 in Clear Spring | US 40 Alternate in Boonsboro | 01927-01-011927 | current | |
| MD 69 | — | — | Mount Zion Road near Braddock Heights | US 40 Alternate in Braddock Heights | 01927-01-011927 | 01956-01-011956 | |
| MD 70 | 2.32 | 3.73 | MD 450 in Annapolis | Bestgate Road in Parole | 01954-01-011954 | current | |
| MD 70 | — | — | US 340 in Knoxville | Florida Avenue in Brunswick | 01927-01-011927 | 01950-01-011950 | |
| MD 71 | — | — | MD 26 in Ceresville | PA 194 near Taneytown | 01927-01-011927 | 01956-01-011956 | |
| MD 71 | — | — | US 50 in Queenstown | DE 71 near Warwick | 01956-01-011956 | 01959-01-011959 | |
| MD 72 | — | — | US 15 in Lewistown | North of Creagerstown | 01927-01-011927 | 01956-01-011956 | |
| MD 73 | — | — | Frederick | Yellow Springs | 01927-01-011927 | 01969-01-011969 | |
| MD 74 | — | — | Frederick | Poole Jones Road near Frederick | 01927-01-011927 | 01956-01-011956 | |
| MD 75 | 28.40 | 45.71 | MD 355 near Hyattstown | MD 31 in New Windsor | 01927-01-011927 | current | |
| MD 76 | 5.69 | 9.16 | MD 77 at Rocky Ridge | US 15 near Emmitsburg | 01927-01-011927 | current | |
| MD 77 | 20.74 | 33.38 | MD 64 in Smithsburg | MD 194 in Keymar | 01927-01-011927 | current | |
| MD 78 | — | — | Adamstown | US 340 near Frederick | 01927-01-011927 | 01970-01-011970 | |
| MD 79 | 0.85 | 1.37 | MD 17 / MD 464 in Rosemont | Petersville Road in Rosemont | 01927-01-011927 | current | |
| MD 80 | 14.79 | 23.80 | MD 85 in Buckeystown | MD 27 near Damascus | 01927-01-011927 | current | |
| MD 81 | — | — | MD 806 in Thurmont | Fort Ritchie | 01927-01-011927 | 01977-01-011977 | |
| MD 82 | — | — | MD 191 in Bethesda | MD 410 in Chevy Chase | 01929-01-011929 | 01997-01-011997 | |
| MD 83 | — | — | MD 31 in New Windsor | one block south of MD 31 in New Windsor | 01927-01-011927 | 01956-01-011956 | |
| MD 84 | 5.75 | 9.25 | MD 75 in New Windsor | MD 832 in Tyrone | 01927-01-011927 | current | |
| MD 85 | 10.82 | 17.41 | MD 28 in Tuscarora | Frederick | 01970-01-011970 | current | |
| MD 85 | — | — | Frederick–Carroll county line near Middleburg | Middleburg | 01927-01-011927 | 01956-01-011956 | |
| MD 86 | 4.00 | 6.44 | MD 30 in Manchester | PA 516 in Lineboro | 01927-01-011927 | current | |
| MD 87 | — | — | Carrollton | MD 31 in Mexico | 01927-01-011927 | 01956-01-011956 | |
| MD 88 | 8.01 | 12.89 | MD 30 Business in Hampstead | MD 25 near Butler | 01927-01-011927 | current | |
| MD 89 | — | — | MD 88 in Hampstead | Carroll–Baltimore county line near Hampstead | 01927-01-011927 | 01956-01-011956 | |
| MD 90 | 11.83 | 19.04 | US 50 near Whaleyville | MD 528 in Ocean City | 01972-01-011972 | current | |
| MD 90 | — | — | Houcksville | MD 30 in Hampstead | 01927-01-011927 | 01956-01-011956 | |
| MD 91 | 7.86 | 12.65 | MD 32 at Gamber | MD 30 near Upperco | 01927-01-011927 | current | |
| MD 92 | — | — | MD 64 in Smithsburg | East of Smithsburg | 01934-01-011934 | 01956-01-011956 | |
| MD 93 | — | — | MD 26 at Shervettes Corner | Carroll–Baltimore county line near Shervettes Corner | 01927-01-011927 | 01956-01-011956 | |
| MD 94 | 6.25 | 10.06 | Patuxent River near Damascus | Old Frederick Road near Lisbon | 01927-01-011927 | current | |
| MD 95 | — | — | West of Comus | MD 109 at Comus | 01930-01-011930 | 01999-01-011999 | |
| MD 96 | — | — | Union Chapel Road near Glenwood | MD 144 near Lisbon | 01927-01-011927 | 01956-01-011956 | |
| MD 97 | 55.27 | 88.95 | US 29 / MD 384 in Silver Spring | PA 97 near Littlestown, PA | 01927-01-011927 | current | |
| MD 98 | — | — | MD 32 in Glenelg | MD 144 near Ellicott City | 01927-01-011927 | 01956-01-011956 | |
| MD 99 | 7.57 | 12.18 | MD 32 near West Friendship | US 29 in Ellicott City | 01927-01-011927 | current | |
| MD 100 | 22.05 | 35.49 | US 29 in Ellicott City | MD 177 in Jacobsville | 01970-01-011970 | current | |
| MD 100 | — | — | MD 99 near Ellicott City | Howard–Baltimore county line near Ellicott City | 01927-01-011927 | 01956-01-011956 | |
| MD 101 | — | — | MD 99 near West Friendship | Howard–Carroll county line at Henryton | 01927-01-011927 | 01956-01-011956 | |
| MD 102 | — | — | Ellicott City | MD 144 in Ellicott City | 01927-01-011927 | 01956-01-011956 | |
| MD 103 | 8.29 | 13.34 | St. John's Lane in Ellicott City | Dorsey | 01927-01-011927 | current | |
| MD 104 | 1.14 | 1.83 | MD 108 near Columbia | MD 103 near Ellicott City | 01979-01-011979 | current | |
| MD 104 | — | — | MD 103 near Ellicott City | Howard–Baltimore county line at Ilchester | 01927-01-011927 | 01956-01-011956 | |
| MD 105 | — | — | MD 144 in Ellicott City | MD 100 in Ellicott City | 01927-01-011927 | 01956-01-011956 | |
| MD 106 | — | — | Glenelg | US 1 in Savage | 01927-01-011927 | 01946-01-011946 | |
| MD 107 | 4.79 | 7.71 | MD 109 in Poolesville | MD 28 in Dawsonville | 01927-01-011927 | current | |
| MD 108 | 34.23 | 55.09 | MD 27 in Damascus | MD 175 in Columbia | 01927-01-011927 | current | |
| MD 109 | 11.87 | 19.10 | MD 107 in Poolesville | MD 355 in Hyattstown | 01927-01-011927 | current | |
| MD 110 | — | — | Old Annapolis Road near Mount Airy | Shirley Bohn Road near Mount Airy | 01948-01-011948 | 01949-01-011949 | |
| MD 112 | 2.81 | 4.52 | MD 190 near Seneca | MD 28 in Darnestown | 01927-01-011927 | current | |
| MD 114 | 1.16 | 1.87 | MD 117 in Gaithersburg | MD 355 in Gaithersburg | 02022-01-012022 | current | Unsigned |
| MD 114 | — | — | MD 124 in Gaithersburg | Gaithersburg | 01930-01-011930 | 01974-01-011974 | |
| MD 115 | 5.83 | 9.38 | MD 124 in Redland | MD 655 at Norbeck | 01928-01-011928 | current | |
| MD 116 | — | — | US 29 / MD 108 in Ashton | Brighton Dam Road near Brinklow | 01928-01-011928 | 01960-01-011960 | |
| MD 117 | 12.67 | 20.39 | MD 28 in Dawsonville | MD 355 in Gaithersburg | 01927-01-011927 | current | |
| MD 118 | 7.08 | 11.39 | MD 28 in Darnestown | MD 355 in Germantown | 01927-01-011927 | current | |
| MD 119 | 7.47 | 12.02 | MD 28 in Rockville | Middlebrook Road in Germantown | 01999-01-011999 | current | |
| MD 119 | — | — | Near Germantown | MD 117 in Germantown | 01927-01-011927 | 01958-01-011958 | |
| MD 120 | — | — | MD 118 in Germantown | Germantown | 01930-01-011930 | 01999-01-011999 | |
| MD 121 | 3.96 | 6.37 | MD 117 in Boyds | Stringtown Road in Clarksburg | 01927-01-011927 | current | section from MD 117 to MD 28 decommissioned 1999 |
| MD 122 | 2.96 | 4.76 | Rolling Road in Woodlawn | Cooks Lane in Baltimore | 01991-01-011991 | current | |
| MD 122 | — | — | Clarksburg Road near Damascus | MD 27 in Damascus | 01927-01-011927 | 01974-01-011974 | |
| MD 123 | — | — | MD 75 near Hyattstown | MD 122 near Damascus | 01927-01-011927 | 01974-01-011974 | |
| MD 124 | 17.03 | 27.41 | MD 28 in Gaithersburg | MD 108 in Damascus | 01927-01-011927 | current | |
| MD 125 | 3.59 | 5.78 | Howard–Baltimore county line near Woodstock | Just east of Dogwood Road in Randallstown | 01927-01-011927 | current | |
| MD 126 | — | — | Windsor Mill Road in Woodlawn | MD 26 in Baltimore | 01927-01-011927 | 01999-01-011999 | |
| MD 127 | — | — | MD 140 in Reisterstown | Western Maryland Railway near Glyndon | 01927-01-011927 | 01987-01-011987 | |
| MD 128 | 7.62 | 12.26 | MD 30 / MD 795 in Reisterstown | MD 25 in Butler | 01930-01-011930 | current | |
| MD 129 | 15.43 | 24.83 | US 40 in Baltimore | Garrison Forest Road near Reisterstown | 01927-01-011927 | current | |
| MD 130 | 5.57 | 8.96 | MD 140 in Garrison | MD 25 in Brooklandville | 01927-01-011927 | current | |
| MD 131 | 3.06 | 4.92 | MD 25 in Brooklandville | MD 45 in Lutherville | 01927-01-011927 | current | |
| MD 132 | 2.15 | 3.46 | Aberdeen | Norman Avenue in Aberdeen | — | — | Longest section |
| MD 132 | — | — | MD 131 near Mays Chapel | Timonium Road near Mays Chapel | 01930-01-011930 | 01961-01-011961 | |
| MD 133 | 3.31 | 5.33 | MD 129 in Pikesville | MD 25 near Brooklandville | 01927-01-011927 | current | |
| MD 134 | 1.63 | 2.62 | MD 139 near Towson | Ruxton Road near Towson | 01928-01-011928 | current | |
| MD 135 | 29.00 | 46.67 | US 219 in Oakland | US 220 in McCoole | — | — | |
| MD 136 | 30.04 | 48.34 | MD 7 near Riverside | MD 23 in Norrisville | 01927-01-011927 | current | |
| MD 137 | 8.50 | 13.68 | Gunpowder Road near Hampstead | MD 45 in Hereford | 01927-01-011927 | current | |
| MD 138 | 9.24 | 14.87 | MD 45 in Hereford | MD 23 in Shawsville | 01927-01-011927 | current | |
| MD 139 | 7.88 | 12.68 | US 1 in Baltimore | I-695 in Lutherville | 01927-01-011927 | current | |
| MD 140 | 49.72 | 80.02 | US 1 in Baltimore | PA 16 near Emmitsburg | — | — | |
| MD 141 | — | — | MD 139 in Towson | US 111 / MD 146 / MD 148 in Towson | 01927-01-011927 | 01961-01-011961 | |
| MD 142 | — | — | Wiseburg Road in White Hall | MD 23 in Shawsville | 01927-01-011927 | 01981-01-011981 | |
| MD 143 | — | — | MD 45 in Cockeysville | Just north of Bosley Road near Loch Raven Reservoir | 01927-01-011927 | 01983-01-011983 | |
| MD 144 | 17.55 | 28.24 | MD 807 in Cumberland | US 40 Scenic near Flintstone | — | — | Longest section |
| MD 144 | — | — | US 111 / MD 141 / MD 148 in Towson | Hampton Lane in Hampton | 01927-01-011927 | 01940-01-011940 | |
| MD 145 | 10.34 | 16.64 | MD 45 in Cockeysville | MD 165 near Baldwin | 01927-01-011927 | current | |
| MD 146 | 16.81 | 27.05 | MD 45 in Towson | MD 23 near Jarrettsville | 01928-01-011928 | current | |
| MD 147 | 18.82 | 30.29 | US 1 in Baltimore | US 1 / US 1 Business near Bel Air | 01927-01-011927 | current | |
| MD 148 | — | — | US 111 / MD 146 / MD 141 in Towson | US 1 in Perry Hall | 01927-01-011927 | 01963-01-011963 | |
| MD 149 | — | — | White Marsh | Chase | 01927-01-011927 | 01966-01-011966 | |
| MD 150 | 13.01 | 20.94 | US 40 in Baltimore | Graces Quarter Road in Chase | 01927-01-011927 | current | |
| MD 151 | 10.80 | 17.38 | Sparrows Point | US 1 in Baltimore | 01927-01-011927 | current | |
| MD 152 | 17.34 | 27.91 | Aberdeen Proving Ground | MD 146 near Jarrettsville | 01927-01-011927 | current | |
| MD 153 | — | — | US 1 in Bel Air | MD 7 in Edgewood | 01927-01-011927 | 01940-01-011940 | |
| MD 153 | — | — | I-70 in Myersville | Wolfsville | 01956-01-011956 | 01985-01-011985 | |
| MD 154 | — | — | MD 22 near Churchville | Kalmia | 01927-01-011927 | 01955-01-011955 | |
| MD 155 | 9.12 | 14.68 | MD 22 in Churchville | US 40 / MD 7 in Havre de Grace | 01927-01-011927 | current | |
| MD 156 | 3.92 | 6.31 | MD 22 near Churchville | MD 155 near Havre de Grace | 01927-01-011927 | current | swapped with MD 155 in 1952 |
| MD 157 | 4.79 | 7.71 | MD 158 in Sparrows Point | I-695 in Dundalk | — | — | |
| MD 157 | — | — | MD 462 near Aberdeen | Havre de Grace | 01927-01-011927 | 01956-01-011956 | |
| MD 158 | 2.35 | 3.78 | Riverside Drive in Sparrows Point | North Point Road in Edgemere | — | — | |
| MD 158 | — | — | US 40 in Belcamp | Creswell Road near Belcamp | 01927-01-011927 | 01956-01-011956 | |
| MD 159 | 4.73 | 7.61 | Bush River | US 40 / MD 7 in Aberdeen | 01928-01-011928 | current | |
| MD 160 | — | — | MD 161 in Darlington | US 1 at Conowingo Dam | 01930-01-011930 | 01955-01-011955 | |
| MD 161 | 5.38 | 8.66 | MD 155 near Havre de Grace | US 1 in Darlington | 01927-01-011927 | current | |
| MD 162 | 2.31 | 3.72 | MD 176 near Glen Burnie | MD 170 in Linthicum | — | — | |
| MD 162 | — | — | US 1 near Darlington | Susquehanna River | 01928-01-011928 | 01956-01-011956 | |
| MD 163 | — | — | MD 165 near Pylesville | Deer Creek | 01933-01-011933 | 01955-01-011955 | |
| MD 164 | 2.63 | 4.23 | Carpenter Point | MD 267 in Charlestown | 01933-01-011933 | 01979-01-011979 | |
| MD 165 | 20.38 | 32.80 | Just north of Long Green Pike in Baldwin | PA 74 in Cardiff | 01927-01-011927 | current | |
| MD 166 | 2.71 | 4.36 | I-195 in Arbutus | MD 144 in Catonsville | 01927-01-011927 | current | |
| MD 167 | — | — | MD 170 in Linthicum | Patapsco River | 01929-01-011929 | 01974-01-011974 | |
| MD 168 | 1.28 | 2.06 | Hammonds Ferry Road in North Linthicum | MD 648 in Pumphrey | 01929-01-011929 | current | |
| MD 169 | 0.97 | 1.56 | Hammonds Ferry Road in Linthicum Heights | MD 648 in Linthicum | — | — | |
| MD 170 | 12.98 | 20.89 | MD 175 in Odenton | MD 2 in Brooklyn Park | 01927-01-011927 | current | |
| MD 171 | 1.54 | 2.48 | MD 2 in Brooklyn Park | MD 173 in Baltimore | 01927-01-011927 | current | |
| MD 172 | 0.17 | 0.27 | U.S. Coast Guard Yard | MD 173 in Baltimore | 01930-01-011930 | current | |
| MD 173 | 13.73 | 22.10 | Fort Smallwood Park | MD 2 in Baltimore | 01927-01-011927 | current | |
| MD 174 | 5.94 | 9.56 | Fort Meade | MD 3 Business in Glen Burnie | 01927-01-011927 | current | |
| MD 175 | 17.01 | 27.37 | Little Patuxent Parkway in Columbia | MD 3 in Millersville | 01927-01-011927 | current | |
| MD 176 | 5.68 | 9.14 | Hanover | MD 648 in Glen Burnie | 01929-01-011929 | current | |
| MD 177 | 10.92 | 17.57 | MD 2 in Pasadena | Gibson Island | 01927-01-011927 | current | |
| MD 178 | 8.06 | 12.97 | MD 450 in Parole | Veterans Highway near Millersville | 01927-01-011927 | current | |
| MD 179 | 3.16 | 5.09 | MD 648 near Annapolis | Cape Saint Claire | 01927-01-011927 | current | |
| MD 180 | 14.63 | 23.54 | US 340 in Knoxville | I-70 in Frederick | — | — | |
| MD 180 | — | — | Fort Meade | US 301 in Millersville | 01930-01-011930 | 01946-01-011946 | |
| MD 181 | 0.16 | 0.26 | Spa Creek Bridge in Annapolis | Spa Creek Bridge in Annapolis | 01927-01-011927 | current | decommissioned in 1999 and recommissioned in 2009 |
| MD 182 | 6.60 | 10.62 | MD 97 in Glenmont | MD 108 near Sandy Spring | 01927-01-011927 | current | |
| MD 183 | — | — | MD 97 in Glenmont | MD 650 in Colesville | 01927-01-011927 | 01981-01-011981 | |
| MD 184 | 0.36 | 0.58 | US 29 in Silver Spring | Blair Road in Washington, D.C. | 01927-01-011927 | 01999-01-011999 | |
| MD 185 | 8.32 | 13.39 | Connecticut Avenue in Washington, D.C. | MD 97 in Aspen Hill | — | — | |
| MD 185 | — | — | MD 184 | MD 605 | 01927-01-011927 | 01958-01-011958 | bridge over railroad that has nothing remaining |
| MD 186 | 1.52 | 2.45 | Western Avenue in Washington, D.C. | MD 410 in Chevy Chase | 01927-01-011927 | current | |
| MD 187 | 5.04 | 8.11 | MD 355 / MD 410 in Bethesda | Executive Boulevard in North Bethesda | 01927-01-011927 | current | |
| MD 188 | 3.25 | 5.23 | MacArthur Boulevard in Glen Echo | MD 187 in Bethesda | 01927-01-011927 | current | |
| MD 189 | 5.05 | 8.13 | MD 190 in Potomac | Maryland Avenue in Rockville | 01927-01-011927 | current | |
| MD 190 | 15.88 | 25.56 | MD 112 in Seneca | River Road in Washington, D.C. | 01927-01-011927 | current | |
| MD 191 | 7.16 | 11.52 | MD 190 in Potomac | MD 185 in Chevy Chase | 01927-01-011927 | current | section from MD 190 to Macarthur Blvd decommissioned 1999 |
| MD 192 | 2.82 | 4.54 | Summit Avenue in Kensington | MD 97 in Forest Glen | 01927-01-011927 | current | |
| MD 193 | 26.07 | 41.96 | MD 185 in Kensington | MD 202 near Upper Marlboro | 01927-01-011927 | current | |
| MD 194 | 22.40 | 36.05 | MD 26 in Ceresville | PA 194 near Taneytown | 01956-01-011956 | current | |
| MD 194 | — | — | MD 195 in Takoma Park | MD 516 in Silver Spring | 01927-01-011927 | 01956-01-011956 | |
| MD 195 | 1.90 | 3.06 | Carroll Avenue in Washington, D.C. | MD 193 in Takoma Park | 01930-01-011930 | current | |
| MD 196 | — | — | US 29 in White Oak | MD 198 in Burtonsville | 01930-01-011930 | 01999-01-011999 | |
| MD 197 | 14.64 | 23.56 | US 301 in Bowie | MD 198 in Laurel | 01927-01-011927 | current | |
| MD 198 | 14.14 | 22.76 | MD 650 near Spencerville | Fort Meade | 01927-01-011927 | current | |
| MD 199 | — | — | US 50 near Glenn Dale | Washington, Baltimore and Annapolis Electric Railway | 01927-01-011927 | 01956-01-011956 | |
| MD 200 | 17.47 | 28.12 | I-370 in Derwood | US 1 near Beltsville | 02011-01-012011 | current | |
| MD 200 | — | — | MD 4 in Coral Hills | MD 214 in Capitol Heights | 01927-01-011927 | 01955-01-011955 | |
| MD 201 | 9.40 | 15.13 | DC 295 near Bladensburg | MD 212 in Beltsville | 01927-01-011927 | current | |
| MD 202 | 13.92 | 22.40 | MD 450 in Bladensburg | MD 725 near Upper Marlboro | 01927-01-011927 | current | |
| MD 203 | — | — | US 1 in College Park | Baltimore & Ohio Railroad | 01927-01-011927 | 01957-01-011957 | |
| MD 204 | — | — | Takoma Park | MD 212 in Chillum | 01928-01-011928 | 01955-01-011955 | |
| MD 205 | — | — | US 50 in Bladensburg | MD 430 in Greenbelt | 01927-01-011927 | 01956-01-011956 | |
| MD 205 | — | — | MD 5 in Waldorf | US 301 / MD 5 in Waldorf | 01989-01-011989 | 01997-01-011997 | |
| MD 206 | 3.17 | 5.10 | MD 212 near Beltsville | Old Gunpowder Road in West Laurel | 02014-01-012014 | current | |
| MD 206 | — | — | US 1 Alternate in Cottage City | US 1 in Brentwood | 01927-01-011927 | 01970-01-011970 | |
| MD 207 | — | — | MD 208 in Cottage City | Bunker Hill Rd. in Cottage City | 01927-01-011927 | 01970-01-011970 | 2 roads on each side of the Amtrak train tracks. |
| MD 208 | 1.86 | 2.99 | US 1 Alternate in Cottage City | MD 500 in Hyattsville | 01927-01-011927 | current | |
| MD 209 | — | — | MD 212 in Chillum | Hyattsville | 01927-01-011927 | 01946-01-011946 | |
| MD 210 | 20.86 | 33.57 | Indian Head Naval Surface Weapons Center | South Capitol Street in Washington, D.C. | 01955-01-011955 | current | |
| MD 210 | — | — | Queens Chapel Road in Washington, D.C. | MD 209 in Hyattsville | 01927-01-011927 | 01946-01-011946 | |
| MD 211 | — | — | Sargent Road in Washington, D.C. | MD 212 in Chillum | 01927-01-011927 | 01997-01-011997 | |
| MD 212 | 10.43 | 16.79 | Riggs Road in Washington, D.C. | MD 201 in Beltsville | 01927-01-011927 | current | |
| MD 213 | 68.25 | 109.84 | MD 662 in Wye Mills | PA 841 near Fair Hill | — | — | |
| MD 214 | 24.97 | 40.19 | East Capitol Street in Washington, D.C. | Beverly Beach | 01927-01-011927 | current | |
| MD 215 | — | — | MD 103 near Elkridge | US 1 in Elkridge | 01927-01-011927 | 01956-01-011956 | |
| MD 216 | 9.06 | 14.58 | MD 108 in Highland | MD 198 in Laurel | 01927-01-011927 | current | |
| MD 217 | — | — | MD 103 near Elkridge | Ilchester | 01927-01-011927 | 01956-01-011956 | |
| MD 218 | 1.14 | 1.83 | Suitland Road in Washington, D.C. | MD 458 in Suitland | 01927-01-011927 | current | |
| MD 219 | 0.22 | 0.35 | Section of future course of US 219 in Oakland | Section of future course of US 219 in Oakland | — | — | |
| MD 221 | 0.59 | 0.95 | Section of Ritchie–Marlboro Road through its interchange with I-95 / I-495 near Largo | Section of Ritchie–Marlboro Road through its interchange with I-95 / I-495 near Largo | — | — | |
| MD 221 | — | — | MD 214 near Largo | MD 4 near Upper Marlboro | 01927-01-011927 | 01955-01-011955 | |
| MD 222 | 11.36 | 18.28 | MD 7 in Perryville | US 1 near Conowingo | 01972-01-011972 | current | |
| MD 223 | 12.65 | 20.36 | Piscataway | Melwood | 01927-01-011927 | current | |
| MD 224 | 26.70 | 42.97 | MD 6 at Riverside | MD 227 at Pomonkey | 01927-01-011927 | current | Section along MD 227 to MD 210 deleted 1956; section along MD 210 and Livingston Road deleted 1955 |
| MD 225 | 10.59 | 17.04 | MD 210 in Potomac Heights | US 301 in La Plata | 01927-01-011927 | current | |
| MD 226 | — | — | MD 224 at Bryans Road | Marshall Hall | 01927-01-011927 | 01956-01-011956 | |
| MD 227 | 13.96 | 22.47 | Marshall Hall | US 301 in White Plains | 01927-01-011927 | current | |
| MD 228 | 6.86 | 11.04 | MD 210 in Accokeek | US 301 / MD 5 Business in Waldorf | 01927-01-011927 | current | |
| MD 229 | 5.25 | 8.45 | MD 227 near Bennsville | MD 228 near Bennsville | 01995-01-011995 | current | |
| MD 229 | — | — | Morgantown | MD 3 at Wayside | 01927-01-011927 | 01956-01-011956 | |
| MD 230 | — | — | MD 3 at Newburg | Mount Victoria | 01927-01-011927 | 01956-01-011956 | |
| MD 231 | 16.39 | 26.38 | Olivers Shop Road near Bryantown | MD 765 in Prince Frederick | 01927-01-011927 | current | |
| MD 232 | — | — | MD 234 at Wicomico | MD 382 near Waldorf | 01927-01-011927 | 01989-01-011989 | |
| MD 233 | — | — | MD 5 near Waldorf | Charles–Prince George's county line near Aquasco | 01927-01-011927 | 01956-01-011956 | |
| MD 234 | 19.02 | 30.61 | US 301 near Newburg | MD 5 in Leonardtown | 01927-01-011927 | current | |
| MD 235 | 30.63 | 49.29 | MD 5 in Ridge | MD 5 in Oraville | 01927-01-011927 | current | Longest state highway within a single county |
| MD 236 | 6.19 | 9.96 | MD 234 near Budds Creek | MD 5 in Charlotte Hall | 01930-01-011930 | current | |
| MD 237 | 2.95 | 4.75 | MD 246 in Lexington Park | MD 235 in California | 01987-01-011987 | current | |
| MD 237 | — | — | MD 234 / MD 238 at Chaptico | MD 5 near Leonardtown | 01927-01-011927 | 01961-01-011961 | |
| MD 238 | 10.83 | 17.43 | MD 242 near Bushwood | MD 5 near Morganza | 01927-01-011927 | current | |
| MD 239 | 1.64 | 2.64 | Bushwood | MD 242 near Bushwood | 01927-01-011927 | current | |
| MD 241 | — | — | MD 242 / MD 470 at Avenue | Abell | 01928-01-011928 | 01956-01-011956 | |
| MD 242 | 12.80 | 20.60 | Coltons Point | MD 5 at Morganza | 01927-01-011927 | current | |
| MD 243 | 4.62 | 7.44 | Compton | MD 5 in Leonardtown | 01927-01-011927 | current | |
| MD 244 | 10.48 | 16.87 | MD 5 near Leonardtown | MD 249 in Valley Lee | 01927-01-011927 | current | |
| MD 245 | 7.55 | 12.15 | MD 5 in Leonardtown | Sotterley | 01927-01-011927 | current | |
| MD 246 | 3.35 | 5.39 | MD 5 in Great Mills | Naval Air Station Patuxent River | 01927-01-011927 | current | |
| MD 247 | 2.89 | 4.65 | MD 5 near Loveville | Oakville Road in Oakville | 01942-01-011942 | current | |
| MD 247 | 2.89 | 4.65 | MD 246 in Lexington Park | near Hermanville | 01927-01-011927 | 01933-01-011933 | |
| MD 248 | — | — | MD 246 near Jarboesville | Cedar Point | 01927-01-011927 | 01943-01-011943 | |
| MD 249 | 9.84 | 15.84 | St. George Island | MD 5 at Callaway | 01927-01-011927 | current | |
| MD 250 | — | — | West of Valley Lee | MD 249 at Valley Lee | 01927-01-011927 | 01946-01-011946 | |
| MD 250 | 0.19 | 0.31 | US 13 Business in Pocomoke City | US 13 / US 113 in Pocomoke City | 01946-01-011946 | current | |
| MD 251 | — | — | MD 249 at Valley Lee | Drayden | 01928-01-011928 | 01946-01-011946 | |
| MD 251 | — | — | MD 430 at Berwyn Heights | MD 434 at Berwyn Heights | 01946-01-011946 | 01977-01-011977 | |
| MD 252 | — | — | Millers Wharf Road | MD 5 at Ridge | 01927-01-011927 | 01983-01-011983 | |
| MD 253 | 1.34 | 2.16 | MD 214 in Edgewater | MD 2 in Edgewater | 01927-01-011927 | current | |
| MD 254 | — | — | MD 424 in Davidsonville | MD 2 in Edgewater | 01927-01-011927 | 01939-01-011939 | |
| MD 254 | 1.25 | 2.01 | Cobb Island | MD 257 near Rock Point | 01958-01-011958 | current | |
| MD 255 | 4.21 | 6.78 | MD 2 near Owensville | Galesville | 01927-01-011927 | current | |
| MD 256 | 5.28 | 8.50 | MD 2 in Tracys Landing | MD 468 in Shady Side | 01927-01-011927 | current | |
| MD 257 | — | — | MD 2 in Tracys Landing | Deale | 01927-01-011927 | 01939-01-011939 | |
| MD 257 | 9.75 | 15.69 | MD 254 near Rock Point | US 301 in Newburg | 01957-01-011957 | current | |
| MD 258 | 7.13 | 11.47 | MD 4 in Bristol | MD 256 in Deale | 01928-01-011928 | current | |
| MD 259 | 2.67 | 4.30 | MD 794 in Bristol | MD 408 near Lothian | 01928-01-011928 | current | |
| MD 260 | 8.68 | 13.97 | MD 4 at Lyons Creek | MD 261 in Chesapeake Beach | 01927-01-011927 | current | |
| MD 261 | 12.86 | 20.70 | MD 263 near Parran | MD 778 in Friendship | 01930-01-011930 | current | |
| MD 262 | 4.47 | 7.19 | Lower Marlboro | MD 4 in Sunderland | 01927-01-011927 | current | |
| MD 263 | 6.17 | 9.93 | MD 2 / MD 4 near Huntingtown | Plum Point | 01927-01-011927 | current | |
| MD 264 | 6.66 | 10.72 | Broomes Island | MD 2 / MD 4 near Port Republic | 01927-01-011927 | current | |
| MD 265 | 1.75 | 2.82 | Wallville | MD 264 at Mutual | 01929-01-011929 | current | |
| MD 266 | — | — | Sollers | MD 2 in Lusby | 01928-01-011928 | 01957-01-011957 | |
| MD 267 | 1.90 | 3.06 | MD 7 near Charlestown | MD 7 in Charlestown | 01927-01-011927 | current | |
| MD 268 | 11.68 | 18.80 | US 40 in Perryville | US 1 at Conowingo | 01927-01-011927 | 01938-01-011938 | |
| MD 268 | 0.95 | 1.53 | Main Street in Elkton | MD 279 in Elkton | 01968-01-011968 | current | |
| MD 269 | 6.40 | 10.30 | US 222 in Port Deposit | MD 276 near Colora | 01927-01-011927 | 01984-01-011984 | |
| MD 270 | 2.16 | 3.48 | MD 648 in Glen Burnie | MD 3 Business in Glen Burnie | 01932-01-011932 | current | |
| MD 271 | 0.33 | 0.53 | North from MD 7 in Perryville | North from MD 7 in Perryville | 01930-01-011930 | 01968-01-011968 | |
| MD 272 | 20.67 | 33.27 | Elk Neck State Park | PA 272 near Calvert | 01927-01-011927 | current | |
| MD 273 | 16.74 | 26.94 | US 1 near Harrisville | DE 273 near Newark, DE | 01927-01-011927 | current | |
| MD 274 | 7.35 | 11.83 | MD 273 in Rising Sun | MD 272 at Bay View | 01927-01-011927 | current | |
| MD 275 | — | — | MD 213 in Kingstown | dead end in Kingstown | 01927-01-011927 | 01946-01-011946 | |
| MD 275 | 2.22 | 3.57 | MD 222 / MD 824 in Perryville | MD 276 near Port Deposit | 01967-01-011967 | current | |
| MD 276 | 7.85 | 12.63 | MD 222 in Port Deposit | US 1 near Harrisville | 01927-01-011927 | current | |
| MD 277 | 2.51 | 4.04 | Elk Mills | MD 279 near Elkton | 01927-01-011927 | current | |
| MD 278 | 0.21 | 0.34 | Delaware state line in northeastern Cecil County | Pennsylvania state line in northeastern Cecil County | 01927-01-011927 | 01946-01-011946 | |
| MD 279 | 4.95 | 7.97 | US 40 / MD 7 near Elkton | DE 279 near Elkton | 01927-01-011927 | current | |
| MD 280 | 9.40 | 15.13 | US 40 / US 213 in Elkton | PA 841 near Fair Hill | 01927-01-011927 | 01971-01-011971 | |
| MD 281 | 2.12 | 3.41 | MD 7 in Elkton | Old Baltimore Pike at the Delaware state line near Elkton | 01933-01-011933 | current | |
| MD 282 | 12.43 | 20.00 | White Crystal Beach | DE 299 near Warwick | 01927-01-011927 | current | |
| MD 283 | 4.46 | 7.18 | Crystal Beach | MD 282 in Earleville | 01928-01-011928 | 01958-01-011958 | |
| MD 284 | 0.25 | 0.40 | Hemphill Street between intersections with MD 285 in Chesapeake City | Hemphill Street between intersections with MD 285 in Chesapeake City | 01927-01-011927 | current | |
| MD 285 | 2.43 | 3.91 | MD 213 near Chesapeake City | Chesapeake City Road at Delaware state line near Chesapeake City | 01930-01-011930 | current | |
| MD 286 | 2.09 | 3.36 | MD 537 in Chesapeake City | DE 286 near Chesapeake City | 01930-01-011930 | current | |
| MD 287 | 2.88 | 4.63 | MD 313 in Goldsboro | DE 10 near Sandtown, DE | 01933-01-011933 | current | |
| MD 288 | 3.33 | 5.36 | MD 20 in Rock Hall | Crosby | 01927-01-011927 | current | |
| MD 289 | 8.83 | 14.21 | Cliffs City | MD 213 in Chestertown | 01927-01-011927 | current | |
| MD 290 | 17.20 | 27.68 | MD 300 near Sudlersville | MD 299 in Sassafras | 01927-01-011927 | current | |
| MD 291 | 18.34 | 29.52 | MD 20 in Chestertown | DE 6 near Millington | 01930-01-011930 | current | |
| MD 292 | 4.61 | 7.42 | MD 298 in Still Pond | Betterton | 01927-01-011927 | current | |
| MD 293 | — | — | Ericsson Avenue in Betterton | Ericsson Avenue in Betterton | 01930-01-011930 | 01988-01-011988 | Longest section |
| MD 294 | — | — | Wheeler Avenue in Betterton | Wheeler Avenue in Betterton | 01930-01-011930 | 01948-01-011948 | |
| MD 295 | — | — | Howell Point Road in Betterton | Howell Point Road in Betterton | 01930-01-011930 | 01948-01-011948 | |
| MD 295 | 32.52 | 52.34 | US 50 near Cheverly | US 40 in Baltimore | — | — | |
| MD 296 | — | — | First Avenue in Betterton | First Avenue in Betterton | 01930-01-011930 | 01948-01-011948 | |
| MD 297 | 3.59 | 5.78 | MD 213 near Chestertown | MD 298 in Worton | 01927-01-011927 | current | |
| MD 298 | 20.14 | 32.41 | MD 20 in Fairlee | MD 291 near Chesterville | 01930-01-011930 | current | |
| MD 299 | 5.67 | 9.12 | MD 313 / MD 330 at Massey | US 301 near Warwick | 01929-01-011929 | current | |
| MD 300 | 13.55 | 21.81 | MD 213 in Church Hill | DE 300 near Sudlersville | 01927-01-011927 | current | Contiguous sections |
| MD 301 | — | — | MD 300 at Dudley Corners | Crumpton | 01927-01-011927 | 01940-01-011940 | |
| MD 302 | 10.21 | 16.43 | US 301 near Barclay | DE 11 near Templeville | 01927-01-011927 | current | |
| MD 303 | — | — | US 213 south of Centreville | Queen Anne | 01927-01-011927 | 01955-01-011955 | |
| MD 303 | 4.20 | 6.76 | MD 309 in Cordova | MD 404 in Queen Anne | 01961-01-011961 | current | |
| MD 304 | 15.23 | 24.51 | Corsica Neck Road west of Centreville | MD 312 in Bridgetown | 01927-01-011927 | current | |
| MD 305 | 5.08 | 8.18 | MD 213 in Centreville | Hope | 01927-01-011927 | current | |
| MD 306 | 4.13 | 6.65 | Federalsburg | Delaware state line near Federalsburg | 01927-01-011927 | current | |
| MD 307 | 6.05 | 9.74 | MD 331 in Hurlock | Federalsburg | 01927-01-011927 | current | |
| MD 308 | 0.12 | 0.19 | MD 313 / MD 318 in Federalsburg | Federalsburg | 01927-01-011927 | current | |
| MD 309 | 18.50 | 29.77 | US 50 in Easton | MD 213 near Centreville | 01927-01-011927 | current | |
| MD 310 | 3.96 | 6.37 | MD 213 near Chesapeake City | Churchtown Road at Delaware state line near Chesapeake City | 01927-01-011927 | current | |
| MD 311 | 6.11 | 9.83 | MD 313 in Goldsboro | MD 454 in Marydel | 01927-01-011927 | current | |
| MD 312 | 11.41 | 18.36 | MD 404 near Ridgely | MD 313 at Baltimore Corner | 01927-01-011927 | current | |
| MD 313 | 75.72 | 121.86 | US 50 in Mardela Springs | MD 213 / MD 290 in Galena | 01927-01-011927 | current | Contiguous sections |
| MD 314 | 4.93 | 7.93 | Greensboro | DE 12 in Whiteleysburg | 01927-01-011927 | current | |
| MD 315 | — | — | Sunset Avenue in Greensboro | MD 313 / MD 480 in Greensboro | 01927-01-011927 | 01950-01-011950 | |
| MD 315 | 3.13 | 5.04 | MD 313 / MD 318 in Federalsburg | MD 318 near Federalsburg | 01964-01-011964 | current | |
| MD 316 | 2.67 | 4.30 | MD 279 in Elkton | MD 277 near Elk Mills | 01927-01-011927 | current | |
| MD 317 | 4.78 | 7.69 | MD 313 near Denton | DE 14 in Burrsville | 01927-01-011927 | current | |
| MD 318 | 11.32 | 18.22 | MD 16 / MD 331 near Preston | DE 18 near Federalsburg | 01927-01-011927 | current | |
| MD 319 | — | — | MD 16 / MD 331 near Preston | Federalsburg | 01928-01-011928 | 01956-01-011956 | |
| MD 320 | 2.84 | 4.57 | Piney Branch Road in Washington, D.C. | MD 650 in Adelphi | 01927-01-011927 | current | |
| MD 321 | — | — | Old Washington Rd (then MD 477) in Elkridge | US 1 in Elkridge | 01931-01-011931 | 01954-01-011954 | |
| MD 322 | — | — | Brumbaugh St in Elkridge | Railroad in Elkridge | 01931-01-011931 | 01946-01-011946 | |
| MD 322 | — | — | MD 313 near Federalsburg | MD 16 / MD 404 at Andersontown | 01952-01-011952 | 01954-01-011954 | |
| MD 322 | 5.12 | 8.24 | US 50 south of Easton | US 50 in Easton | — | — | |
| MD 323 | — | — | Railroad in Elkridge | Railroad Ave in Elkridge | 01931-01-011931 | 01946-01-011946 | |
| MD 324 | 0.40 | 0.64 | Preston | MD 16 / MD 331 in Preston | 01927-01-011927 | current | |
| MD 325 | — | — | Spring Grove State Hospital | MD 144 in Catonsville | 01930-01-011930 | 01978-01-011978 | |
| MD 326 | — | — | Leonardtown Wharf | MD 5 in Leonardtown | 01933-01-011933 | 01985-01-011985 | |
| MD 327 | — | — | MD 6 near Port Tobacco | US 301 near La Plata | 01930-01-011930 | 01956-01-011956 | |
| MD 327 | 0.51 | 0.82 | MD 7 in Perryville | Perryville | 01968-01-011968 | current | |
| MD 328 | 15.24 | 24.53 | US 50 in Easton | West Denton | 01927-01-011927 | current | |
| MD 329 | 3.29 | 5.29 | MD 33 west of Royal Oak | MD 33 east of Royal Oak | 01927-01-011927 | current | |
| MD 330 | — | — | US 1 in Kingsville | Bradshaw Road in Kingsville | 01927-01-011927 | 01985-01-011985 | |
| MD 330 | 3.72 | 5.99 | MD 299 / MD 313 at Massey | Clayton Road at Delaware state line near Massey | 01988-01-011988 | current | |
| MD 331 | 28.74 | 46.25 | US 50 in Vienna | US 50 in Easton | — | — | |
| MD 331 | — | — | MD 16 in Cambridge | US 213 in Easton | 01927-01-011927 | 01939-01-011939 | |
| MD 332 | 1.07 | 1.72 | Central Avenue in Washington, D.C. | MD 214 in Seat Pleasant | — | — | |
| MD 332 | — | — | MD 565 in Easton | MD 331 in Easton | 01927-01-011927 | 01961-01-011961 | |
| MD 333 | 9.79 | 15.76 | Oxford | Washington Street in Easton | 01927-01-011927 | current | |
| MD 334 | 0.61 | 0.98 | MD 322 in Easton | Washington Street in Easton | 01927-01-011927 | current | |
| MD 335 | 16.36 | 26.33 | Hooper's Island | MD 16 in Church Creek | 01927-01-011927 | current | |
| MD 336 | 4.87 | 7.84 | MD 335 at Crossroads | Lakesville | 01927-01-011927 | current | |
| MD 337 | 3.41 | 5.49 | MD 5 in Camp Springs | MD 4 in Meadows | 01927-01-011927 | current | |
| MD 338 | 1.24 | 2.00 | Octoraro Creek | US 1 / US 222 at Conowingo | 01927-01-011927 | 01979-01-011979 | |
| MD 339 | — | — | MD 331 in Rhodesdale | MD 331 in Rhodesdale | 01927-01-011927 | 01954-01-011954 | |
| MD 339 | — | — | US 29 in Silver Spring | MD 320 in Silver Spring | 01955-01-011955 | 01999-01-011999 | |
| MD 341 | 1.25 | 2.01 | MD 16 near Cambridge | MD 343 in Cambridge | — | — | |
| MD 341 | — | — | MD 14 near Brookview | MD 14 near Brookview | 01927-01-011927 | 01965-01-011965 | |
| MD 342 | — | — | MD 16 near Secretary | MD 14 in Secretary | 01927-01-011927 | 01939-01-011939 | Became part of MD 14 |
| MD 342 | 2.82 | 4.54 | MD 310 at St. Augustine | MD 537 in Chesapeake City | 01941-01-011941 | current | |
| MD 343 | 11.29 | 18.17 | Hudson | US 50 in Cambridge | 01927-01-011927 | current | |
| MD 344 | — | — | MD 16 at Mount Holly | US 213 in Vienna | 01927-01-011927 | 01939-01-011939 | |
| MD 344 | 2.16 | 3.48 | MD 6 in Doncaster | MD 224 near Chicamuxen | 01957-01-011957 | current | |
| MD 345 | — | — | Backbone Mountain | US 50 near Redhouse | 01940-01-011940 | 01954-01-011954 | |
| MD 346 | 23.72 | 38.17 | US 50 Business in Salisbury | US 50 near Berlin | — | — | |
| MD 347 | 6.92 | 11.14 | MD 349 in Quantico | US 50 in Hebron | 01927-01-011927 | current | |
| MD 348 | 1.39 | 2.24 | Sharptown | DE 24 near Sharptown | 01930-01-011930 | current | |
| MD 349 | 22.32 | 35.92 | Nanticoke | US 50 Business in Salisbury | 01927-01-011927 | current | |
| MD 350 | 11.80 | 18.99 | Main Street in Salisbury | MD 354 in Powellville | 01927-01-011927 | current | |
| MD 351 | — | — | Little Brown Road | MD 663 in Fruitland | 01927-01-011927 | 01956-01-011956 | |
| MD 351 | 4.24 | 6.82 | Church Hill | MD 180 in Frederick | 01987-01-011987 | 02002-01-012002 | |
| MD 351 | 4.24 | 6.82 | Church Hill | MD 180 in Frederick | 02003-01-012003 | 02014-01-012014 | |
| MD 352 | 10.03 | 16.14 | MD 349 at Coxs Corner | MD 349 near Catchpenny | 01933-01-011933 | current | |
| MD 353 | 5.08 | 8.18 | US 50 in Pittsville | MD 54 / DE 54 / DE 26 at the Delaware state line near Gumboro, DE | 01927-01-011927 | current | |
| MD 354 | 14.98 | 24.11 | MD 12 near Snow Hill | US 50 in Willards | 01927-01-011927 | current | |
| MD 355 | 36.94 | 59.45 | Wisconsin Avenue in Washington, D.C. | Frederick | 01954-01-011954 | current | |
| MD 355 | 0.1 | 0.16 | MD 413 in Crisfield | MD 413 in Crisfield | 01927-01-011927 | 01954-01-011954 | |
| MD 356 | — | — | MD 413 near Kingston | MD 667 in Kingston | 01927-01-011927 | 01961-01-011961 | |
| MD 357 | — | — | Tulls Corner Road near Marion Station | Charles Cannon Road near Marion Station | 01927-01-011927 | 01991-01-011991 | |
| MD 358 | 1.13 | 1.82 | MD 413 in Crisfield | Near Crisfield | 01927-01-011927 | current | Originally MD 475; formerly continued south and east to MD 380 |
| MD 359 | — | — | Boone Road | MD 380 near Crisfield | 01927-01-011927 | 01960-01-011960 | |
| MD 359 | 1.09 | 1.75 | Pocomoke City | MD 756 near Pocomoke City | 01974-01-011974 | current | |
| MD 360 | — | — | Sackertown Road | MD 358 near Crisfield | 01927-01-011927 | 01960-01-011960 | |
| MD 361 | 5.62 | 9.04 | Fairmount | MD 413 in Westover | 01927-01-011927 | current | |
| MD 362 | 6.23 | 10.03 | Mount Vernon | MD 675 in Princess Anne | 01929-01-011929 | current | |
| MD 363 | 18.30 | 29.45 | Deal Island | Mansion Avenue in Princess Anne | 01927-01-011927 | current | |
| MD 364 | 5.43 | 8.74 | US 13 / US 13 Business in West Pocomoke | Pocomoke State Forest | 01927-01-011927 | current | |
| MD 365 | 6.29 | 10.12 | US 113 Business in Snow Hill | Public Landing | 01927-01-011927 | current | |
| MD 366 | 11.17 | 17.98 | US 13 Business in Pocomoke City | George Island Landing | 01927-01-011927 | current | |
| MD 367 | 2.60 | 4.18 | Bishop | Hudson Road at Delaware state line near Bishopville | 01927-01-011927 | current | |
| MD 368 | 0.28 | 0.45 | MD 367 in Bishopville | Bishopville | 01927-01-011927 | current | |
| MD 369 | — | — | US 113 in Basket Switch | Railroad Crossing | 01927-01-011927 | 01956-01-011956 | |
| MD 370 | 1.58 | 2.54 | MD 33 near Easton | Unionville | 01933-01-011933 | current | |
| MD 371 | 4.27 | 6.87 | Cedar Hall | Pocomoke City | 01930-01-011930 | current | |
| MD 372 | 2.86 | 4.60 | MD 166 in Arbutus | US 1 in Baltimore | 01927-01-011927 | current | |
| MD 373 | 8.16 | 13.13 | MD 210 in Accokeek | Brandywine Road near Brandywine | 01927-01-011927 | current | |
| MD 374 | 9.98 | 16.06 | MD 354 in Powellville | MD 818 in Berlin | 01927-01-011927 | current | |
| MD 375 | 0.06 | 0.097 | MD 818 in Berlin | MD 374 in Berlin | 01927-01-011927 | current | |
| MD 376 | 4.56 | 7.34 | MD 818 in Berlin | MD 611 near Sinepuxent | 01927-01-011927 | current | |
| MD 377 | 0.78 | 1.26 | MD 376 in Berlin | MD 346 in Berlin | 01927-01-011927 | current | |
| MD 378 | 1.49 | 2.40 | MD 528 in Ocean City | MD 528 in Ocean City | 01927-01-011927 | current | |
| MD 379 | — | — | MD 5 in Leonardtown | End of pavement | 01939-01-011939 | 01978-01-011978 | |
| MD 380 | 1.56 | 2.51 | Lawsonia | Crisfield | 01934-01-011934 | current | |
| MD 381 | 15.91 | 25.60 | MD 231 in Patuxent | US 301 in Brandywine | 01927-01-011927 | current | |
| MD 382 | 15.34 | 24.69 | Poplar Hill | US 301 in Marlton | 01927-01-011927 | current | |
| MD 383 | 5.48 | 8.82 | MD 180 near Jefferson | MD 17 near Middletown | 01930-01-011930 | current | |
| MD 384 | 0.53 | 0.85 | MD 390 in Silver Spring | US 29 / MD 97 in Silver Spring | 01929-01-011929 | current | |
| MD 385 | — | — | Marshyhope Creek | Delaware state line | 01927-01-011927 | 01946-01-011946 | |
| MD 385 | — | — | MD 352 north of Whitehaven | MD 349 | 01948-01-011948 | 01964-01-011964 | |
| MD 386 | — | — | Truck House Road | MD 648 in Severna Park | 01930-01-011930 | 01973-01-011973 | |
| MD 387 | 1.68 | 2.70 | Ferry Point Road near Annapolis | MD 435 / MD 450 in Annapolis | 01930-01-011930 | current | |
| MD 388 | 2.38 | 3.83 | MD 675 in Princess Anne | East of Princess Anne | 01930-01-011930 | current | |
| MD 389 | — | — | MD 214 | MD 704 in Seat Pleasant | 01930-01-011930 | 01955-01-011955 | |
| MD 390 | 1.09 | 1.75 | 16th Street in Washington, D.C. | MD 97 in Silver Spring | 01930-01-011930 | current | |
| MD 391 | — | — | MD 192 in Forest Glen | MD 320 in Silver Spring | 01930-01-011930 | 01999-01-011999 | |
| MD 392 | 13.54 | 21.79 | MD 16 in East New Market | DE 20 in Reliance | 01930-01-011930 | current | |
| MD 393 | — | — | MD 468 | Galesville | 01930-01-011930 | 01949-01-011949 | |
| MD 393 | 0.63 | 1.01 | MD 2 in Parole | MD 450 in Annapolis | 01953-01-011953 | current | |
| MD 394 | — | — | West of Templeville | East of Templeville | 01930-01-011930 | 01939-01-011939 | Became part of MD 302 |
| MD 394 | — | — | US 219 at Gortner | Loch Lynn Heights | 01940-01-011940 | 01954-01-011954 | |
| MD 394 | — | — | US 113 at Snow Hill | US 113 | 01977-01-011977 | 01997-01-011997 | |
| MD 395 | — | — | US 220 at Snow Hill | US 40 | 01927-01-011927 | 01983-01-011983 | |
| MD 396 | 2.21 | 3.56 | MD 614 in Bethesda | Massachusetts Avenue in Washington, D.C. | 01931-01-011931 | current | |
| MD 397 | — | — | Indian Bone Road in Airey | US 50/MD 16 in Mount Holly | 01930-01-011930 | 01973-01-011973 | |
| MD 398 | — | — | US 11 in Williamsport | MD 58 in Cearfoss | 01930-01-011930 | 01957-01-011957 | |
| MD 399 | — | — | MD 108 in Damascus | near Long Corner Road | 01930-01-011930 | 01974-01-011974 | |
| MD 400 | — | — | MD 140 | Mount Wilson Hospital Center near Garrison | 01930-01-011930 | 01989-01-011989 | |
| MD 401 | — | — | MD 25 | Yeoho Road near Butler | 01930-01-011930 | 01985-01-011985 | |
| MD 402 | 4.33 | 6.97 | MD 2 / MD 4 in Prince Frederick | Dares Beach | 01930-01-011930 | current | |
| MD 403 | — | — | MD 155 | MD 155 | 01930-01-011930 | 01942-01-011942 | |
| MD 403 | — | — | MD 500 in Hyattsville | US 1 in Riverdale | 01942-01-011942 | 01956-01-011956 | |
| MD 404 | 24.61 | 39.61 | MD 662 in Wye Mills | DE 404 near Andersontown | 01930-01-011930 | current | |
| MD 405 | 8.59 | 13.82 | MD 304 near Ruthsburg | MD 19 near Church Hill | 01930-01-011930 | current | |
| MD 406 | — | — | MD 667 in Hudson Corner | US 13 in West Pocomoke | 01930-01-011930 | 01961-01-011961 | |
| MD 407 | 3.81 | 6.13 | MD 31 near Marston | MD 27 near Taylorsville | 01930-01-011930 | current | |
| MD 408 | — | — | Aberdeen Proving Ground (then the Edgewood Arsenal) | MD 7 in Edgewood | 01930-01-011930 | 01952-01-011952 | |
| MD 408 | 5.62 | 9.04 | MD 4 at Waysons Corner | MD 2 / MD 422 in Lothian | 01965-01-011965 | current | |
| MD 409 | — | — | Northern Central Railway at Freeland | Interstate 83 at Maryland Line | 01930-01-011930 | 01991-01-011991 | |
| MD 410 | 13.92 | 22.40 | MD 187 / MD 355 in Bethesda | Pennsy Drive near Glenarden | 01930-01-011930 | current | |
| MD 411 | — | — | MD 206 (now MD 208) in Brentwood | US 1 in Hyattsville | 01930-01-011930 | 01946-01-011946 | |
| MD 412 | — | — | US 1 in Riverdale | MD 201 in Riverdale | 01930-01-011930 | 01991-01-011991 | two sections; western section removed in 1978 |
| MD 413 | 14.61 | 23.51 | Crisfield | US 13 near Westover | 01930-01-011930 | current | |
| MD 414 | 5.11 | 8.22 | Oxon Hill | MD 5 in Silver Hill | 01930-01-011930 | current | |
| MD 415 | — | — | MD 5 | Chesapeake Bay shore near Scotland | 01930-01-011930 | 01956-01-011956 | |
| MD 416 | — | — | MD 4 at Waysons Corner | Solomons | 01930-01-011930 | 01965-01-011965 | |
| MD 417 | — | — | US 40 (now US 40 Alternate) | Pennsylvania State Line at Grantsville | 01930-01-011930 | 01963-01-011963 | |
| MD 418 | 4.62 | 7.44 | MD 60 in Leitersburg | PA QR 2007 near Ringgold | 01930-01-011930 | current | |
| MD 419 | — | — | Martinsburg Road curve near Potomac River in Dickerson | Mt. Ephraim Road and Sugarloaf Mountain Road in Dickerson | 01930-01-011930 | 01959-01-011959 | was concurrent with MD 28 from Martinsburg Road to Mt. Ephraim Road |
| MD 420 | — | — | Goshen Road in Goshen | Sundown Road east of Laytonsville | 01930-01-011930 | 01973-01-011973 | section from Goshen Road to MD 124 removed 1959 |
| MD 421 | — | — | MD 190 near Travilah | Glen Road near Travilah | 01930-01-011930 | 01959-01-011959 | |
| MD 422 | 3.04 | 4.89 | Bayard | MD 2 / MD 408 in Lothian | — | — | |
| MD 423 | 2.79 | 4.49 | MD 2 near Tracys Landing | Fairhaven | — | — | |
| MD 424 | 8.24 | 13.26 | MD 214 in Davidsonville | MD 3 in Crofton | — | — | |
| MD 425 | 11.77 | 18.94 | MD 6 near Nanjemoy | MD 224 near Mason Springs | — | — | |
| MD 426 | — | — | Potomac River | MD 6 in Travilah | 01930-01-011930 | 01956-01-011956 | |
| MD 427 | — | — | Port Tobacco River | US 301 in Bel Alton | 01930-01-011930 | 01989-01-011989 | |
| MD 428 | — | — | MD 6 in Dentsville | MD 234 in Newport | 01930-01-011930 | 01956-01-011956 | |
| MD 429 | — | — | Popes Creek | US 301 in Faulkner | 01930-01-011930 | 01956-01-011956 | |
| MD 430 | 0.49 | 0.79 | US 1 in College Park | MD 193 in College Park | — | — | |
| MD 431 | — | — | MD 244 (now Drayden Road) in Drayden | End of state maintenance | 01930-01-011930 | 01956-01-011956 | |
| MD 431 | 2.06 | 3.32 | MD 201 in Riverdale Park | US 1 in College Park | 02019-01-012019 | current | |
| MD 432 | — | — | Stringtown Road | MD 27 near Clarksburg | 01930-01-011930 | 01956-01-011956 | |
| MD 432 | 0.25 | 0.40 | Spur from Guilford Road in Columbia | Spur from Guilford Road in Columbia | 01971-01-011971 | current | |
| MD 433 | — | — | Powder Mill Road west of US 1 in Beltsville | Powder Mill Road east of US 1 in Beltsville | 01930-01-011930 | 01946-01-011946 | Became part of an extended MD 212 |
| MD 433 | — | — | Near Smithville | Old Denton Road north of Federalsburg | 01948-01-011948 | 01958-01-011958 | |
| MD 433 | 1.29 | 2.08 | MD 410 in New Carrollton | MD 450 in New Carrollton | 02019-01-012019 | current | |
| MD 434 | — | — | US 1 in College Park | MD 201 in Berwyn Heights | 01930-01-011930 | 01991-01-011991 | Two sections; western section removed 1962 |
| MD 435 | 1.16 | 1.87 | MD 387 / MD 450 in Annapolis | MD 450 in Annapolis | 01930-01-011930 | current | |
| MD 436 | 1.14 | 1.83 | MD 435 in Annapolis | Bestgate Road in Parole | 01930-01-011930 | current | |
| MD 437 | — | — | MD 435 in Annapolis | MD 436 (now Melvin Avenue) in Annapolis | 01930-01-011930 | 01975-01-011975 | Became part of relocated MD 436 |
| MD 438 | — | — | MD 436 (now Annapolis Street) in Annapolis | Wardour Drive in Annapolis | 01930-01-011930 | 01975-01-011975 | |
| MD 439 | 7.19 | 11.57 | MD 45 near Maryland Line | MD 23 in Shawsville | 01930-01-011930 | current | |
| MD 440 | 5.65 | 9.09 | MD 543 at Ady | US 1 near Dublin | 01930-01-011930 | current | |
| MD 441 | 0.50 | 0.80 | Little Elk Creek near Fair Hill | MD 280 near Fair Hill | 01938-01-011938 | 01958-01-011958 | |
| MD 442 | 0.36 | 0.58 | MD 292 near Betterton | Rosedale Cannery Road near Betterton | 01930-01-011930 | 01987-01-011987 | |
| MD 443 | 0.88 | 1.42 | Clark Road near Betterton | MD 292 near Betterton | 01930-01-011930 | 01987-01-011987 | |
| MD 444 | 7.29 | 11.73 | MD 290 in Chesterville | Kentmore Park | 01930-01-011930 | current | |
| MD 445 | 11.96 | 19.25 | Eastern Neck National Wildlife Refuge | MD 21 in Tolchester Beach | 01930-01-011930 | current | |
| MD 446 | 6.03 | 9.70 | Broad Neck | MD 20 near Chestertown | 01930-01-011930 | current | |
| MD 447 | 10.35 | 16.66 | US 213 in Chestertown | MD 290 in Chesterville | 01930-01-011930 | 01963-01-011963 | |
| MD 447 | 0.84 | 1.35 | MD 213 near Locust Grove | MD 444 near Locust Grove | 01969-01-011969 | 01987-01-011987 | |
| MD 448 | 5.94 | 9.56 | Morgnec Road near Kennedyville | Turners Creek near the Sassafras River | 01930-01-011930 | 01987-01-011987 | |
| MD 449 | 0.07 | 0.11 | MD 213 near Locust Grove | MD 444 near Locust Grove | 01969-01-011969 | current | |
| MD 449 | 0.53 | 0.85 | Two sections of old US 222 in Perryville | Two sections of old US 222 in Perryville | 01934-01-011934 | 01958-01-011958 | |
| MD 450 | 0.53 | 0.85 | MD 404 near Andersontown | Delaware state line | 01930-01-011930 | 01939-01-011939 | Became part of MD 16 |
| MD 450 | 30.42 | 48.96 | US 1 Alternate in Bladensburg | US 50 / US 301 / MD 2 near Annapolis | 01954-01-011954 | current | |
| MD 451 | — | — | Claiborne | MD 33 | 01930-01-011930 | 01998-01-011998 | |
| MD 452 | 1.64 | 2.64 | US 50 near Berlin | MD 575 in Friendship | 01930-01-011930 | current | |
| MD 453 | — | — | MD 144 | Woodmont | 01933-01-011933 | 01956-01-011956 | |
| MD 454 | 2.21 | 3.56 | DE 8 in Marydel | MD 302 in Templeville | 01933-01-011933 | current | |
| MD 455 | — | — | Waller Road | MD 353 | 01939-01-011939 | 01968-01-011968 | |
| MD 456 | 1.22 | 1.96 | US 50 near Queenstown | MD 18 in Queenstown | 01933-01-011933 | current | Contiguous sections |
| MD 457 | — | — | Tuckahoe Creek | MD 404 in Denton | 01933-01-011933 | 01946-01-011946 | |
| MD 457 | — | — | MD 313 | MD 317 in Burrsville | 01950-01-011950 | 01958-01-011958 | |
| MD 458 | 3.12 | 5.02 | MD 5 in Hillcrest Heights | Walker Mill Road in District Heights | 01933-01-011933 | current | |
| MD 459 | 1.25 | 2.01 | US 50 in Cheverly | MD 201 near Cheverly | 01933-01-011933 | current | |
| MD 460 | 0.78 | 1.26 | Crisfield | MD 413 in Crisfield | 01933-01-011933 | current | |
| MD 461 | — | — | US 1 near Bel Air | US 1 near Bel Air | 01933-01-011933 | 01950-01-011950 | |
| MD 462 | 4.15 | 6.68 | MD 132 in Aberdeen | MD 155 near Havre de Grace | 01933-01-011933 | current | |
| MD 463 | — | — | MD 45 in Parkton | MD 45 in Parkton | 01933-01-011933 | 01998-01-011998 | |
| MD 464 | 8.10 | 13.04 | MD 17 / MD 79 in Rosemont | Ballenger Creek Pike in Point of Rocks | 01933-01-011933 | current | |
| MD 465 | — | — | MD 178 in Crownsville | River Road | 01933-01-011933 | 01968-01-011968 | |
| MD 466 | — | — | Francis Avenue in Relay | US 1 in Relay | 01972-01-011972 | 01978-01-011978 | |
| MD 467 | — | — | MD 313 in Mardela Springs | Delaware state line | 01941-01-011941 | 01968-01-011968 | |
| MD 468 | 11.19 | 18.01 | Shady Side | MD 214 in Edgewater | 01933-01-011933 | current | |
| MD 469 | — | — | MD 6 in Port Tobacco | Purcell Road | 01933-01-011933 | 01956-01-011956 | |
| MD 470 | 3.75 | 6.04 | MD 242 at Avenue | MD 242 at Dynard | 01933-01-011933 | current | |
| MD 471 | 0.99 | 1.59 | MD 5 in Great Mills | Great Mills | 01933-01-011933 | current | Until 1956, had another section from MD 5 in Leonardtown to Fairgrounds Road |
| MD 472 | 2.58 | 4.15 | MD 235 in Oakville | Sandgates | 01933-01-011933 | current | |
| MD 473 | 1.25 | 2.01 | MD 273 near Fair Hill | Blake Road near Fair Hill | 01933-01-011933 | 01958-01-011958 | |
| MD 474 | — | — | Maryland, Delaware & Virginia Railroad east of Denton | Maryland, Delaware & Virginia Railroad southeast of Denton | 01933-01-011933 | 01958-01-011958 | |
| MD 475 | — | — | MD 413 in Crisfield | Near Crisfield | 01933-01-011933 | 01946-01-011946 | |
| MD 475 | — | — | US 50 in Salisbury | US 13 in Salisbury | 01950-01-011950 | 01954-01-011954 | |
| MD 475 | — | — | South Street in Frederick | MD 144 in Frederick | 02001-01-012001 | 02009-01-012009 | |
| MD 476 | — | — | MD 144 in Lisbon | north of Old Frederick Road | 01933-01-011933 | 01956-01-011956 | |
| MD 477 | — | — | US 1 near Elkridge | US 1 | 01933-01-011933 | 01983-01-011983 | |
| MD 478 | — | — | US 40 in Parkhead | dead end in Parkhead | 01933-01-011933 | 01955-01-011955 | Old US 40 |
| MD 478 | 1.88 | 3.03 | MD 180 in Knoxville | Brunswick | 01968-01-011968 | current | |
| MD 479 | — | — | US 50 in Cambridge | Eastern Shore State Hospital in Cambridge | 01933-01-011933 | 01983-01-011983 | |
| MD 480 | 9.08 | 14.61 | MD 404 in Hillsboro | MD 313 in Greensboro | 01933-01-011933 | current | |
| MD 481 | 5.13 | 8.26 | MD 309 near Queen Anne | MD 304 in Ruthsburg | 01933-01-011933 | current | |
| MD 482 | 5.41 | 8.71 | MD 27 in Mexico | MD 30 Business in Hampstead | 01933-01-011933 | current | |
| MD 483 | — | — | MD 174 in Severn | MD 174 in Severn | 01933-01-011933 | 01946-01-011946 | |
| MD 484 | — | — | MD 224 in Marbury | MD 425 in Pisgah | 01933-01-011933 | 01987-01-011987 | Until 1957, continued east to MD 6 in Port Tobacco |
| MD 485 | — | — | US 50 (now Ocean Gateway/old MD 731) in Vienna | MD 487 in Vienna | 01933-01-011933 | 01955-01-011955 | now Middle Street |
| MD 485 | 0.65 | 1.05 | Loop from MD 404 near Hillsboro | Loop from MD 404 near Hillsboro | — | — | Longest section |
| MD 486 | — | — | MD 331 (now Rhodesdale Vienna Road) in Vienna | US 50 (now Ocean Gateway/old MD 731) in Vienna | 01933-01-011933 | 01955-01-011955 | Became part of rerouted MD 331; the old route became the turn lane |
| MD 487 | — | — | US 50 (now Ocean Gateway/old MD 731) in Vienna | MD 485 in Vienna | 01933-01-011933 | 01955-01-011955 | now Race Street |
| MD 488 | 6.01 | 9.67 | MD 6 in La Plata | MD 5 in Bryantown | 01933-01-011933 | current | |
| MD 489 | — | — | MD 314 in Whiteleysburg | Delaware state line | 01933-01-011933 | 01950-01-011950 | Now part of MD 314; the old route of MD 314 via 2 State road was decommissioned |
| MD 489 | 1.27 | 2.04 | MD 5 at Park Hall | MD 235 near Park Hall | 01956-01-011956 | current | |
| MD 490 | 0.31 | 0.50 | Commerce Street in Havre de Grace | MD 7 in Havre de Grace | 01933-01-011933 | current | |
| MD 491 | — | — | MD 6 in Ironsides | MD 6 near Ironsides | 01933-01-011933 | 01956-01-011956 | Now part of MD 425 |
| MD 491 | 6.78 | 10.91 | MD 64 in Smithsburg | MD 550 in Fort Ritchie | 01957-01-011957 | current | |
| MD 492 | — | — | District of Columbia boundary | MD 214 near Capitol Heights | 01933-01-011933 | 01954-01-011954 | |
| MD 493 | — | — | creek crossing due south of Martin Plaza Shopping Plaza | MD 150 in Middle River | 01933-01-011933 | 01941-01-011941 | Decommissioned when MD 700 was built |
| MD 494 | 6.83 | 10.99 | PA 75 near Fairview | MD 63 at Cearfoss | 01933-01-011933 | current | |
| MD 495 | 23.02 | 37.05 | MD 135 at Altamont | US 40 Alternate in Grantsville | 01933-01-011933 | current | |
| MD 496 | 7.23 | 11.64 | MD 97 near Westminster | MD 30 near Manchester | 01933-01-011933 | current | |
| MD 497 | 2.68 | 4.31 | MD 2 / MD 4 in Lusby | Cove Point | 01933-01-011933 | current | |
| MD 498 | — | — | MD 249 in Piney Point | Piney Point Light | 01933-01-011933 | 01981-01-011981 | |
| MD 499 | — | — | MD 238 in Maddox | Hurry Road | 01933-01-011933 | 01956-01-011956 | |
| MD 500 | 2.22 | 3.57 | Michigan Avenue in Washington, D.C. | MD 410 in Hyattsville | 01933-01-011933 | current | |
| MD 501 | 1.68 | 2.70 | MD 212 in Chillum | MD 500 in Mount Rainier | 01933-01-011933 | current | |
| MD 502 | — | — | Virginia state line | MD 366 in Stockton | 01946-01-011946 | 01960-01-011960 | |
| MD 503 | — | — | Olivet | MD 2 (now MD 765) near Lusby | 01933-01-011933 | 01957-01-011957 | |
| MD 504 | — | — | near the confluence of Back Creek and St. John Creek | MD 2 (now MD 765) near Lusby | 01933-01-011933 | 01957-01-011957 | |
| MD 505 | — | — | near the confluence of Hellen Creek and the Patuxent River | MD 2 near Lusby | 01933-01-011933 | 01957-01-011957 | |
| MD 506 | 3.79 | 6.10 | MD 508 at Bowens | MD 2 / MD 4 near Port Republic | 01933-01-011933 | current | |
| MD 507 | — | — | Barstow Road & Leitches Wharf Road | MD 2 near Lusby | 01933-01-011933 | 01957-01-011957 | |
| MD 508 | 1.20 | 1.93 | MD 506 at Bowens | MD 231 near Barstow | 01933-01-011933 | current | |
| MD 509 | 1.14 | 1.83 | MD 2 / MD 4 in Port Republic | Kenwood Beach | 01933-01-011933 | current | |
| MD 510 | — | — | Mill Branch Road | MD 262 in Sunderland | 01933-01-011933 | 01957-01-011957 | |
| MD 511 | — | — | Patuxent River | MD 264 near Mutual | 01933-01-011933 | 01957-01-011957 | |
| MD 512 | — | — | Patuxent River | MD 264 near Mutual | 01933-01-011933 | 01957-01-011957 | |
| MD 513 | — | — | Piney Branch Road in Washington, D.C. | MD 320 in Silver Spring | 01933-01-011933 | 01955-01-011955 | |
| MD 513 | 1.77 | 2.85 | Jackson Road near Fruitland | US 13 Business in Fruitland | 01987-01-011987 | current | |
| MD 514 | — | — | Sligo Creek | MD 320/MD 513 in Silver Spring | 01933-01-011933 | 01939-01-011939 | now Park Valley Road; unlabeled on the 1933 and 1935 maps |
| MD 514 | 4.89 | 7.87 | MD 20 in Chestertown | MD 298 at Melitota | 01950-01-011950 | current | |
| MD 515 | — | — | MD 384 in Silver Spring | MD 391 in Silver Spring | 01933-01-011933 | 01960-01-011960 | |
| MD 516 | — | — | US 29 | MD 193 in Silver Spring | 01933-01-011933 | 01999-01-011999 | |
| MD 517 | — | — | MD 24 in Five Forks | MD 23 in Norrisville | 01933-01-011933 | 01956-01-011956 | |
| MD 518 | 0.06 | 0.097 | Section of Main Street in Queen Anne | Section of Main Street in Queen Anne | 01933-01-011933 | current | |
| MD 519 | — | — | Worthington Road near Reisterstown | Dover Road near Reisterstown | 01933-01-011933 | 01979-01-011979 | |
| MD 520 | 2.61 | 4.20 | Whites Neck Creek | MD 239 near Bushwood | 01933-01-011933 | current | |
| MD 521 | 4.43 | 7.13 | Lowery Road near Huntingtown | MD 524 in Huntingtown | 01933-01-011933 | current | |
| MD 523 | — | — | Patuxent River | MD 416 (now MD 4) in Chaneyville | 01933-01-011933 | 01957-01-011957 | |
| MD 523 | — | — | Pennsylvania State line | Resley Street in Hancock | 01966-01-011966 | 01970-01-011970 | |
| MD 524 | — | — | Mount Harmony Road (previously MD 260) | MD 2 (now MD 778) near Owings | 01933-01-011933 | 01957-01-011957 | |
| MD 524 | 0.76 | 1.22 | Loop from MD 2 / MD 4 in Huntingtown | Loop from MD 2 / MD 4 in Huntingtown | 01969-01-011969 | current | |
| MD 525 | — | — | Patuxent River | MD 416 (now MD 4) in Dunkirk | 01933-01-011933 | 01957-01-011957 | |
| MD 526 | — | — | MD 545 in Elkton | MD 280 in Elkton | 01933-01-011933 | 01955-01-011955 | Elkton Blvd; became part of MD 545 |
| MD 526 | — | — | Main Street in Westminster | MD 97,MD 140 in Westminster | 01954-01-011954 | 01999-01-011999 | |
| MD 526 | 0.13 | 0.21 | Spur from MD 140 in Reisterstown | Spur from MD 140 in Reisterstown | 02014-01-012014 | current | |
| MD 527 | — | — | US 1 in Elkridge | Dead end in Elkridge | 01933-01-011933 | 01957-01-011957 | |
| MD 528 | 9.04 | 14.55 | MD 378 in Ocean City | DE 1 in Ocean City | 01933-01-011933 | current | |
| MD 529 | 2.57 | 4.14 | MD 675 in Princess Anne | US 13 near Eden | 01933-01-011933 | current | Formerly continued north through Allen to Salisbury |
| MD 530 | 0.14 | 0.23 | High Street in Chestertown | US 213 in Chestertown | 01933-01-011933 | 01960-01-011960 | |
| MD 531 | — | — | US 1 in Jessup | MD 103 near Ellicott City | 01933-01-011933 | 01946-01-011946 | Became part of MD 175 (now MD 108 and MD 104) |
| MD 531 | — | — | Galestown | MD 392 in Reliance | 01946-01-011946 | 01959-01-011959 | |
| MD 532 | — | — | MD 27 (now MD 808) in Mount Airy | US 40 in Lisbon | 01933-01-011933 | 01956-01-011956 | |
| MD 533 | 1.25 | 2.01 | Cobb Island | MD 3 (now MD 257) near Rock Point | 01933-01-011933 | 01958-01-011958 | Renumbered MD 254 |
| MD 534 | — | — | MD 4 in Forestville | MD 221 (now Ritchie-Marlboro Road) near Largo | 01933-01-011933 | 01955-01-011955 | |
| MD 535 | — | — | MD 14 near Brookview | MD 14 near Brookview | 01933-01-011933 | 01955-01-011955 | |
| MD 535 | 0.16 | 0.26 | MD 5 in Temple Hills | Auth Road in Temple Hills | 02001-01-012001 | current | |
| MD 536 | — | — | MD 6 | south of Mill Swamp Road near Welcome | 01933-01-011933 | 01956-01-011956 | |
| MD 537 | — | — | MD 135 in Swanton | Savage River State Forest | 01933-01-011933 | 01946-01-011946 | Became part of MD 495 |
| MD 537 | 0.49 | 0.79 | MD 213 in Chesapeake City | Chesapeake and Delaware Canal | 01949-01-011949 | current | Longest section |
| MD 537 | 0.71 | 1.14 | Loop from MD 213 near Galena | Loop from MD 213 near Galena | 01951-01-011951 | 01987-01-011987 | |
| MD 539 | — | — | US 29 in Columbia | MD 175 in Jonestown | 01956-01-011956 | 01959-01-011959 | Became part of MD 108 |
| MD 540 | — | — | MD 410 in Takoma Park | MD 513 in Takoma Park | 01933-01-011933 | 01955-01-011955 | Chestnut Avenue |
| MD 541 | — | — | MD 349 | Tyaskin | 01933-01-011933 | 01956-01-011956 | |
| MD 542 | 6.33 | 10.19 | MD 147 in Baltimore | Cromwell Bridge Road in Parkville | 01933-01-011933 | current | |
| MD 543 | 19.08 | 30.71 | US 40 in Riverside | MD 165 in Pylesville | 01933-01-011933 | current | |
| MD 544 | 9.48 | 15.26 | MD 213 in Kingstown | MD 313 near Unicorn | 01933-01-011933 | current | Contiguous sections |
| MD 545 | 5.92 | 9.53 | MD 213 in Elkton | Warburton Road in Cedar Hill | 01933-01-011933 | current | |
| MD 546 | 3.61 | 5.81 | Beall School Road in Finzel | PA QR 2010 near Finzel | 01933-01-011933 | current | |
| MD 547 | 1.80 | 2.90 | MD 355 in North Bethesda | MD 185 in Kensington | 01933-01-011933 | current | |
| MD 548 | — | — | MD 529 (now Allen Road) | south port of the Upper Ferry (Wicomico River) | 01933-01-011933 | 01956-01-011956 | |
| MD 549 | — | — | MD 224 (now Livingston Road) | Fort Washington Park | 01933-01-011933 | 01956-01-011956 | |
| MD 550 | 24.43 | 39.32 | MD 26 in Libertytown | Pen Mar | 01933-01-011933 | current | |
| MD 551 | — | — | MD 343 (now High Street) in Cambridge | MD 16 (now MD 341) | 01946-01-011946 | 01956-01-011956 | Replaced by relocated MD 343 |
| MD 552 | 2.20 | 3.54 | Dominion | US 50 / US 301 in Chester | 01933-01-011933 | current | |
| MD 553 | 0.28 | 0.45 | MD 2 in Edgewater | South River | 01933-01-011933 | current | Longest section |
| MD 554 | — | — | MD 170 (now High Street) in Severn | Fort Meade | 01933-01-011933 | 01983-01-011983 | Replaced by MD 174 |
| MD 555 | — | — | MD 263 in Plum Point | 4 miles south | 01933-01-011933 | 01957-01-011957 | |
| MD 556 | — | — | MD 450 near Woodmore | MD 202 | 01933-01-011933 | 01989-01-011989 | Replaced by MD 193 |
| MD 557 | — | — | MD 355 in Gaithersburg | MD 114 in Gaithersburg | 01933-01-011933 | 01973-01-011973 | |
| MD 558 | — | — | US 301 in Bel Alton | MD 6 in Newtown | 01933-01-011933 | 01956-01-011956 | |
| MD 559 | — | — | Westminster city limits | Tannery | 01933-01-011933 | 01956-01-011956 | |
| MD 560 | 9.32 | 15.00 | US 50 at Gorman | MD 135 in Mountain Lake Park | 01933-01-011933 | current | |
| MD 561 | 2.48 | 3.99 | MD 213 at Hassengers Corner | MD 298 in Lynch | 01933-01-011933 | current | |
| MD 562 | 1.39 | 2.24 | Markoe Road near Monkton | MD 138 near Monkton | 01933-01-011933 | current | |
| MD 563 | — | — | MD 6 in Riverside | MD 224 (now MD 344) in Chicamuxen | 01933-01-011933 | 01956-01-011956 | |
| MD 564 | 6.73 | 10.83 | MD 450 in Lanham | Bowie | 01934-01-011934 | current | |
| MD 565 | 5.18 | 8.34 | Trappe | US 50 near Easton | 01941-01-011941 | current | Longest section |
| MD 566 | 1.19 | 1.92 | MD 292 in Still Pond | MD 298 near Still Pond | 01946-01-011946 | current | |
| MD 567 | — | — | Cromwell Valley Park near Towson | Cub Hill Road near Carney | 01934-01-011934 | 01998-01-011998 | |
| MD 568 | 0.41 | 0.66 | MD 367 in Bishopville | Bishopville Road at the Delaware state line near Bishopville | 01934-01-011934 | current | |
| MD 569 | — | — | Lemmon Road near Westminster | Beggs Road near Westminster | 01934-01-011934 | 01956-01-011956 | |
| MD 570 | — | — | MD 32 near Fenby | Obrecht Road near Eldersburg | 01934-01-011934 | 01954-01-011954 | Became part of MD 97 |
| MD 570 | 1.95 | 3.14 | I-70 / I-695 in Woodlawn | MD 122 / Park and ride in Baltimore | 02020-01-012020 | current | Former I-70 |
| MD 571 | — | — | MD 32 (now MD 140) | Pennsylvania state line in Emmitsburg | 01934-01-011934 | 01950-01-011950 | |
| MD 572 | — | — | MD 67 in Gapland | Washington–Frederick county line in Crampton's Gap | 01934-01-011934 | 01956-01-011956 | |
| MD 573 | — | — | MD 26 in Eldersburg | MD 570 (now MD 97) northwest of Eldersburg | 01934-01-011934 | 01954-01-011954 | |
| MD 574 | — | — | MD 235 (now MD 944) near Hollywood | near Scotch Neck Road near Hollywood | 01934-01-011934 | 01983-01-011983 | |
| MD 575 | — | — | MD 2 (now MD 944) near Huntingtown | MD 261 near Willows | 01934-01-011934 | 01957-01-011957 | |
| MD 575 | 2.70 | 4.35 | US 113 near Berlin | MD 589 near Showell | 02000-01-012000 | current | Longest section |
| MD 576 | — | — | Tulls Corner Road | MD 371 in Pocomoke City | 01934-01-011934 | 01954-01-011954 | |
| MD 577 | 3.70 | 5.95 | MD 392 in Reliance | MD 313 near Federalsburg | 01934-01-011934 | current | |
| MD 578 | 4.24 | 6.82 | MD 331 in Bethlehem | MD 16 at Harmony | 01934-01-011934 | current | |
| MD 579 | 7.84 | 12.62 | Neavitt | MD 33 near Saint Michaels | 01934-01-011934 | current | |
| MD 580 | — | — | US 13 | MD 364 in West Pocomoke | 01946-01-011946 | 01950-01-011950 | |
| MD 581 | — | — | Keysville | MD 71 (now MD 194) south of Keysville | 01934-01-011934 | 01954-01-011954 | |
| MD 582 | — | — | Brookeville Road near Olney | Gregg Road in Montgomery County | 01934-01-011934 | 01956-01-011956 | |
| MD 583 | — | — | Hipsley Mill Road | Daisy Road near Florence | 01934-01-011934 | 01950-01-011950 | |
| MD 584 | 0.38 | 0.61 | Loop from MD 5 in St. Mary's City | Loop from MD 5 in St. Mary's City | 01934-01-011934 | current | |
| MD 585 | — | — | MD 12 | MD 390 near Salisbury | 01934-01-011934 | 01956-01-011956 | |
| MD 586 | 5.78 | 9.30 | MD 28 / MD 911 in Rockville | MD 97 in Wheaton | 01934-01-011934 | current | |
| MD 587 | 1.14 | 1.83 | Dogwood Drive in Middle River | MD 150 in Middle River | 01934-01-011934 | current | |
| MD 588 | 1.94 | 3.12 | MD 7 in Rosedale | Overlea | 01934-01-011934 | current | |
| MD 589 | 4.65 | 7.48 | US 50 near Ocean Pines | US 113 / MD 575 near Showell | 01934-01-011934 | current | |
| MD 590 | — | — | US 1 near Kalmia | US 1 near Dublin | 01935-01-011935 | 01953-01-011953 | |
| MD 591 | 0.80 | 1.29 | Octoraro Creek | US 1 near Conowingo | 01934-01-011934 | current | Longest section |
| MD 592 | 0.23 | 0.37 | MD 273 near Rising Sun | US 1 near Rising Sun | 01934-01-011934 | 01958-01-011958 | |
| MD 593 | — | — | Sligo Creek Parkway in Silver Spring | MD 193 in Silver Spring | 01934-01-011934 | 01958-01-011958 | |
| MD 594 | — | — | MD 391 (now Dale Drive) in Silver Spring | MD 194 (now Flower Avenue) in Silver Spring | 01934-01-011934 | 01958-01-011958 | |
| MD 594 | 1.40 | 2.25 | US 29 in Silver Spring | Flower Avenue in Silver Spring | 02016-01-012016 | current | |
| MD 595 | — | — | MD 391 (now Dale Drive) in Silver Spring | Queen Annes Drive in Silver Spring | 01934-01-011934 | 01958-01-011958 | |
| MD 596 | — | — | MD 391 (now Dale Drive) in Silver Spring | Woodside Parkway in Silver Spring | 01934-01-011934 | 01958-01-011958 | |
| MD 597 | — | — | Dallas Avenue in Silver Spring | US 29 in Silver Spring | 01934-01-011934 | 01946-01-011946 | Replaced by MD 192 |
| MD 597 | — | — | loop off of US 1 near Harwood Park | loop off of US 1 near Harwood Park | 01946-01-011946 | 01956-01-011956 | |
| MD 598 | — | — | US 13 in Westover | US 13 (now MD 675) in Princess Anne | 01934-01-011934 | 01961-01-011961 | |
| MD 599 | — | — | MD 700 (now Orems Road) in Middle River | MD 150 in Middle River | 01934-01-011934 | 01975-01-011975 | Railroad crossing connecting sections eliminated |
| MD 600 | — | — | MD 150 in Middle River | MD 599 in Middle River | 01934-01-011934 | 01975-01-011975 | main section removed 1950 |
| MD 601 | — | — | MD 599 in Middle River | MD 600 in Middle River | 01934-01-011934 | 01975-01-011975 | |
| MD 607 | 1.54 | 2.48 | Woods Road near Jacobsville | MD 173 in Jacobsville | — | — | |
| MD 610 | 6.53 | 10.51 | Bell Road near Whaleyville | US 113 near Bishop | — | — | |
| MD 611 | 8.51 | 13.70 | Assateague State Park | US 50 in West Ocean City | — | — | |
| MD 614 | 1.97 | 3.17 | MacArthur Boulevard in Glen Echo | MD 191 in Bethesda | — | — | |
| MD 615 | 4.35 | 7.00 | I-70 / US 40 near Hancock | Heavenly Acres Ridge Road at the Pennsylvania state line | — | — | |
| MD 617 | 0.35 | 0.56 | Beauchamp Branch Road near Williston | MD 16 in Williston | — | — | |
| MD 619 | 1.09 | 1.75 | 5th Avenue in Denton | MD 313 / MD 404 in Denton | — | — | |
| MD 623 | 7.26 | 11.68 | MD 161 in Darlington | PA QR 2043 near Delta, PA | — | — | |
| MD 624 | 2.87 | 4.62 | MD 165 in Pylesville | PA QR 2080 near Graceton | — | — | |
| MD 625 | 1.36 | 2.19 | MD 5 in Hughesville | MD 5 in Hughesville | — | — | |
| MD 627 | 2.48 | 3.99 | Crab Island Road in Oriole | MD 363 near Oriole | — | — | |
| MD 631 | 0.35 | 0.56 | Spur from Brandywine Road near Brandywine | Spur from Brandywine Road near Brandywine | — | — | |
| MD 632 | 6.71 | 10.80 | MD 63 in Downsville | Wilson Boulevard in Hagerstown | — | — | |
| MD 636 | 0.28 | 0.45 | MD 53 in Cresaptown | US 220 in Cresaptown | — | — | |
| MD 637 | 0.61 | 0.98 | Naylor Road in Washington, D.C. | MD 5 in Hillcrest Heights | — | — | |
| MD 638 | 2.34 | 3.77 | MD 743 in Eckhart Mines | MD 36 near Mount Savage | — | — | |
| MD 639 | 2.79 | 4.49 | MD 51 in Evitts Creek | US 40 Alternate in Cumberland | — | — | |
| MD 640 | 0.58 | 0.93 | Eastern Correctional Institution | US 13 near Westover | — | — | |
| MD 642 | 0.08 | 0.13 | Spur from MD 173 in Orchard Beach | Spur from MD 173 in Orchard Beach | — | — | |
| MD 644 | 0.03 | 0.048 | US 1 in Arbutus | Sulphur Spring Road in Arbutus | — | — | Longest section |
| MD 645 | 0.12 | 0.19 | Spur from Railroad Avenue in Harmans | Spur from Railroad Avenue in Harmans | — | — | Longest section |
| MD 646 | 3.31 | 5.33 | MD 543 at Ady | MD 136 near Whiteford | — | — | |
| MD 648 | 21.52 | 34.63 | US 50/US 301 in Arnold | MD 295 in Baltimore | — | — | This highway is split into multiple sections along Maryland Route 2, Among all the old remnants of Baltimore-Annapolis Boulevard. See historical page for more details. |
| MD 650 | 25.89 | 41.67 | New Hampshire Avenue in Washington, D.C. | MD 108 near Damascus | — | — | |
| MD 652 | 0.69 | 1.11 | Spur from MD 176 near Harmans | Spur from MD 176 near Harmans | — | — | |
| MD 655 | 1.86 | 2.99 | MD 28 at Norbeck | Carrolton Road near Norbeck | — | — | |
| MD 656 | 0.70 | 1.13 | MD 18 in Queenstown | MD 456 in Queenstown | — | — | |
| MD 658 | 0.84 | 1.35 | MD 53 in La Vale | US 40 Alternate in La Vale | — | — | |
| MD 660 | 0.05 | 0.080 | MD 355 in Rockville | MD 28 in Rockville | — | — | |
| MD 661 | 2.22 | 3.57 | MD 289 near Pomona | Chester River | 01939-01-011939 | 01994-01-011994 | |
| MD 662 | 6.10 | 9.82 | Easton | US 50 near Longwoods | — | — | Longest section |
| MD 662 | 3.13 | 5.04 | Railroad crossing in Kennedyville | Turners Creek near the Sassafras River | 01939-01-011939 | 01946-01-011946 | |
| MD 664 | 1.65 | 2.66 | MD 289 near Chestertown | Chester River | 01939-01-011939 | 01960-01-011960 | |
| MD 665 | 2.68 | 4.31 | US 50 / US 301 in Parole | Forest Drive in Annapolis | — | — | |
| MD 667 | 17.61 | 28.34 | Crisfield | US 13 in West Pocomoke | — | — | |
| MD 668 | 0.14 | 0.23 | Spur from Harvey Yingling Road near Manchester | Spur from Harvey Yingling Road near Manchester | — | — | |
| MD 669 | 1.69 | 2.72 | US 40 Alternate in Grantsville | PA 669 near Grantsville | — | — | |
| MD 670 | 1.48 | 2.38 | MD 347 in Hebron | US 50 near Hebron | — | — | |
| MD 672 | 0.19 | 0.31 | Spur from MD 648 near Annapolis | Spur from MD 648 near Annapolis | — | — | |
| MD 673 | 0.53 | 0.85 | MD 413 in Westover | US 13 near Westover | — | — | |
| MD 674 | 0.25 | 0.40 | Rock Hall | MD 20 in Rock Hall | 01940-01-011940 | current | |
| MD 675 | 3.39 | 5.46 | US 13 near Princess Anne | US 13 near Princess Anne | — | — | Longest section |
| MD 685 | 0.16 | 0.26 | Loop from MD 213 at Hack Point | Loop from MD 213 at Hack Point | 01953-01-011953 | 01979-01-011979 | Longest section |
| MD 690 | 1.46 | 2.35 | MD 273 near Rising Sun | Sylmar Road at the Pennsylvania state line | 01957-01-011957 | 01958-01-011958 | |
| MD 694 | 0.10 | 0.16 | Spur from MD 212 in Beltsville | Spur from MD 212 in Beltsville | — | — | |
| MD 697 | 0.25 | 0.40 | MD 274 at Bay View | MD 699 at Bay View | 01969-01-011969 | 01979-01-011979 | |
| MD 698 | 0.11 | 0.18 | Dead end at railroad | High Street in Chestertown | 01940-01-011940 | 01985-01-011985 | |
| MD 699 | 0.99 | 1.59 | Loop from MD 272 at Bay View | Loop from MD 272 at Bay View | 01941-01-011941 | 01979-01-011979 | Longest section |
| MD 700 | 1.97 | 3.17 | US 40 near Rosedale | MD 150 in Middle River | — | — | |
| MD 701 | 0.14 | 0.23 | MD 291 near Millington | US 301 near Millington | 01988-01-011988 | current | Longest section |
| MD 702 | 4.17 | 6.71 | I-695 in Essex | Back River Neck Road near Essex | — | — | |
| MD 703 | 0.08 | 0.13 | MD 366 near Klej Grange | MD 366 near Klej Grange | — | — | |
| MD 704 | 6.53 | 10.51 | 63rd Street in Washington, D.C. | MD 450 in Lanham | — | — | |
| MD 707 | 1.44 | 2.32 | Near Berlin | MD 589 near Ocean Pines | — | — | Longest section |
| MD 710 | 2.83 | 4.55 | MD 2 in Glen Burnie | MD 173 near Brooklyn Park | — | — | |
| MD 711 | 0.51 | 0.82 | MD 2 in Glen Burnie | Arundel Corporation Road in Glen Burnie | — | — | |
| MD 711 | 0.75 | 1.21 | MD 545 near Elkton | MD 280 near Elkton | 01943-01-011943 | 01958-01-011958 | |
| MD 712 | 1.11 | 1.79 | MD 235 in Lexington Park | NAS Patuxent River | — | — | |
| MD 713 | 3.01 | 4.84 | Fort Meade | MD 176 in Hanover | — | — | |
| MD 714 | 0.20 | 0.32 | Rivers Edge West near Millington | MD 291 near Millington | 01957-01-011957 | 01987-01-011987 | |
| MD 715 | 1.06 | 1.71 | US 40 in Aberdeen | Aberdeen Proving Ground | — | — | |
| MD 717 | 0.33 | 0.53 | MD 4 in Upper Marlboro | MD 725 in Upper Marlboro | — | — | |
| MD 723 | 0.18 | 0.29 | Spur from MD 175 in Jessup | Spur from MD 175 in Jessup | — | — | |
| MD 725 | 1.86 | 2.99 | Brown Station Road in Upper Marlboro | US 301 near Upper Marlboro | — | — | |
| MD 726 | 0.28 | 0.45 | Hunt Club Road near Upper Marlboro | Marlboro Pike near Upper Marlboro | — | — | |
| MD 727 | 0.12 | 0.19 | MD 268 in Elkton | Amtrak's Northeast Corridor | 01949-01-011949 | current | Longest section |
| MD 731 | 0.38 | 0.61 | Spur from US 50 near Mardela Springs | Spur from US 50 near Mardela Springs | — | — | Longest section |
| MD 732 | 0.82 | 1.32 | Brock Bridge Road in Annapolis Junction | MD 32 in Annapolis Junction | — | — | Longest section |
| MD 733 | 0.14 | 0.23 | Spur from US 40 Alternate near Grantsville | Spur from US 40 Alternate near Grantsville | — | — | Longest section |
| MD 735 | 0.06 | 0.097 | Virginia Avenue in Hancock | Methodist Street in Hancock | — | — | |
| MD 736 | 1.27 | 2.04 | I-68 / US 40 near Midlothian | Park Avenue in Frostburg | — | — | |
| MD 739 | 0.16 | 0.26 | Old alignment of US 40 in Washington County | Old alignment of US 40 in Washington County | 02019-01-012019 | current | |
| MD 740 | 0.29 | 0.47 | Service road parallel to US 40 in Aberdeen | Service road parallel to US 40 in Aberdeen | 02015-01-012015 | current | |
| MD 741 | 0.06 | 0.097 | Spur from US 40 Alternate near Benevola | Spur from US 40 Alternate near Benevola | — | — | |
| MD 742 | 0.93 | 1.50 | MD 42 in Friendsville | MD 42 / I-68 near Friendsville | — | — | |
| MD 743 | 1.00 | 1.61 | MD 36 in Frostburg | US 40 Alternate in Eckhart Mines | — | — | |
| MD 746 | 0.13 | 0.21 | Spur from MD 25 near Towson | Spur from MD 25 near Towson | — | — | |
| MD 750 | 0.87 | 1.40 | Loop from US 50 / MD 16 near Cambridge | Loop from US 50 / MD 16 near Cambridge | — | — | |
| MD 752 | 0.15 | 0.24 | Spur from MD 231 near Barstow | Spur from MD 231 near Barstow | — | 02017-01-012017 | |
| MD 755 | 1.79 | 2.88 | Aberdeen Proving Ground | US 40 in Edgewood | — | — | |
| MD 756 | 1.17 | 1.88 | US 13 in Pocomoke City | US 113 near Pocomoke City | — | — | |
| MD 758 | 1.02 | 1.64 | Stoney Run Road in Hanover | Ridge Road in Hanover | — | — | |
| MD 759 | 0.21 | 0.34 | Spur from MD 18 in Stevensville | Spur from MD 18 in Stevensville | — | — | |
| MD 760 | 4.65 | 7.48 | Drum Point | MD 2 / MD 4 in Lusby | — | — | |
| MD 761 | 0.23 | 0.37 | Loop from MD 263 near Parran | Loop from MD 263 near Parran | — | — | |
| MD 762 | 0.53 | 0.85 | MD 162 in Linthicum | MD 170 in Linthicum | — | — | |
| MD 763 | 0.28 | 0.45 | MD 155 in Havre de Grace | Juniata Street in Havre De Grace | — | — | |
| MD 764 | 0.09 | 0.14 | Pinewood Terrace near Parran | MD 261 near Parran | — | — | Longest section |
| MD 765 | 5.91 | 9.51 | Dowell Road near Solomons | MD 2 / MD 4 near Lusby | — | — | Longest section |
| MD 768 | 0.68 | 1.09 | MD 402 in Dares Beach | Chesapeake Avenue in Dares Beach | — | — | |
| MD 769 | 1.06 | 1.71 | MD 201 near Bladensburg | MD 201 in Bladensburg | — | — | Longest section |
| MD 776 | 0.77 | 1.24 | MD 312 / MD 480 near Ridgely | MD 312 in Ridgely | — | — | |
| MD 778 | 2.12 | 3.41 | MD 2 in Owings | MD 261 in Friendship | — | — | |
| MD 779 | 0.15 | 0.24 | Spur from MD 174 in Glen Burnie | Spur from MD 174 in Glen Burnie | — | — | Longest section |
| MD 781 | 1.01 | 1.63 | US 40 in Elkton | MD 281 near Elkton | 01984-01-011984 | current | |
| MD 783 | 0.23 | 0.37 | MD 436 in Parole | Riverview Court in Parole | — | — | |
| MD 784 | 0.24 | 0.39 | Spur from MD 436 in Parole | Spur from MD 436 in Parole | — | — | |
| MD 785 | 0.29 | 0.47 | Spur from MD 784 in Parole | Spur from MD 784 in Parole | — | — | |
| MD 787 | 0.20 | 0.32 | MD 195 in Takoma Park | MD 320 | 01956-01-011956 | 02012-01-012012 | ended at MD 516 before 1999. |
| MD 788 | 0.20 | 0.32 | MD 387 in Annapolis | Forest Drive in Annapolis | — | — | |
| MD 794 | 2.75 | 4.43 | MD 4 in Bristol | MD 408 at Waysons Corner | — | — | |
| MD 795 | 0.07 | 0.11 | Cambridge Creek Bridge in Cambridge | Cambridge Creek Bridge in Cambridge | — | — | |
| MD 795 | 0.47 | 0.76 | I-795 / MD 140 in Reisterstown | MD 30 / MD 128 in Reisterstown | — | — | |
| MD 796 | 0.29 | 0.47 | Loop from MD 258 near Tracys Landing | Loop from MD 258 near Tracys Landing | — | — | Longest section |
| MD 797 | 0.27 | 0.43 | State Circle around the Maryland State House in Annapolis | State Circle around the Maryland State House in Annapolis | — | — | |
| MD 798 | 0.34 | 0.55 | Sherwood Forest Road near Crownsville | MD 178 near Crownsville | — | — | |
| MD 800 | 1.57 | 2.53 | MD 75 near Linwood | MD 75 near New Windsor | — | — | Longest section |
| MD 801 | 1.05 | 1.69 | MD 313 near Galena | MD 290 / MD 313 near Galena | 01957-01-011957 | 01987-01-011987 | |
| MD 802 | 1.01 | 1.63 | MD 8 near Normans | MD 8 near Matapeake | — | — | |
| MD 803 | 1.53 | 2.46 | MD 299 near Warwick | Delaware state line near Warwick | 01955-01-011955 | 01979-01-011979 | Two sections |
| MD 804 | 0.79 | 1.27 | Loop from MD 64 in Chewsville | Loop from MD 64 in Chewsville | — | — | |
| MD 805 | 0.15 | 0.24 | Spur from Rocky Forge Road near Leitersburg | Spur from Rocky Forge Road near Leitersburg | — | — | |
| MD 806 | 3.04 | 4.89 | US 15 near Catoctin Furnace | Thurmont | — | — | Longest section |
| MD 807 | 3.52 | 5.66 | Cumberland | US 220 near Dickens | — | — | |
| MD 808 | 2.34 | 3.77 | Ridgeville Boulevard in Mount Airy | MD 27 near Mount Airy | — | — | |
| MD 809 | 0.91 | 1.46 | Loop from MD 273 at Calvert | Loop from MD 273 at Calvert | 01958-01-011958 | 01979-01-011979 | |
| MD 810 | 0.69 | 1.11 | MD 210 in Accokeek | Manning Road in Accokeek | — | — | Longest section |
| MD 811 | 0.19 | 0.31 | South town limit of Rising Sun | MD 273 in Rising Sun | 01958-01-011958 | 01979-01-011979 | |
| MD 812 | 0.19 | 0.31 | Loop from MD 213 at Singerly | Loop from MD 213 at Singerly | 01958-01-011958 | 01982-01-011982 | Longest section |
| MD 813 | 0.12 | 0.19 | MD 313 in Sharptown | State Street in Sharptown | — | — | |
| MD 813 | 2.09 | 3.36 | Dead end near Woodlawn | MD 273 in Harrisville | 01963-01-011963 | 01979-01-011979 | Longest section |
| MD 814 | 0.29 | 0.47 | Monocacy River | Penterra Manor Lane near Creagerstown | — | 02016-01-012016 | |
| MD 815 | 0.72 | 1.16 | Loop from MD 349 near Salisbury | Loop from MD 349 near Salisbury | — | — | |
| MD 816 | — | — | Loop from MD 16 near Madison | Loop from MD 16 near Madison | — | 01970-01-011970 | |
| MD 817 | 0.52 | 0.84 | MD 318 near Linchester | Hunting Creek | — | — | Longest section |
| MD 818 | 2.62 | 4.22 | US 113 in Berlin | US 113 near Berlin | — | — | |
| MD 819 | 0.19 | 0.31 | Loop from MD 331 in Reids Grove | Loop from MD 331 in Reids Grove | — | — | |
| MD 820 | 0.13 | 0.21 | Spur from MD 313 near Goldsboro | Spur from MD 313 near Goldsboro | — | — | |
| MD 821 | 0.40 | 0.64 | Loop from MD 454 in Marydel | Loop from MD 454 in Marydel | — | — | |
| MD 822 | 0.85 | 1.37 | US 13 in Princess Anne | University of Maryland, Eastern Shore | — | — | |
| MD 822 | 0.65 | 1.05 | Spur north from MD 803 near Warwick | Spur north from MD 803 near Warwick | 01955-01-011955 | 01979-01-011979 | |
| MD 823 | 0.61 | 0.98 | MD 316 near Elkton | MD 279 near Elkton | 01962-01-011962 | 01979-01-011979 | |
| MD 824 | 1.06 | 1.71 | MD 222 in Perryville | MD 222 / MD 275 near Perryville | 01952-01-011952 | current | |
| MD 825 | 0.94 | 1.51 | MD 135 near Oakland | MD 135 in Mountain Lake Park | — | — | Longest section |
| MD 826 | 0.60 | 0.97 | Parallels US 219 between a pair of dead ends near Keyser's Ridge | Parallels US 219 between a pair of dead ends near Keyser's Ridge | — | — | Longest section |
| MD 827 | 0.05 | 0.080 | Parallels MD 39 between a pair of dead ends near Crellin | Parallels MD 39 between a pair of dead ends near Crellin | — | — | Longest section |
| MD 828 | 0.13 | 0.21 | Spur from MD 42 near Friendsville | Spur from MD 42 near Friendsville | — | — | Longest section |
| MD 830 | 0.04 | 0.064 | Spur from US 220 near Rawlings | Spur from US 220 near Rawlings | — | — | Longest section |
| MD 831 | 0.90 | 1.45 | Loop from MD 36 in Corriganville | Loop from MD 36 in Corriganville | — | — | Longest section |
| MD 832 | 7.67 | 12.34 | MD 140 in Taneytown | MD 140 in Westminster | — | — | |
| MD 833 | 0.84 | 1.35 | MD 30 Business in Hampstead | MD 88 in Hampstead | — | — | |
| MD 834 | 0.16 | 0.26 | Granny Branch Road near Price | Maryland and Delaware Railroad near Price | — | — | |
| MD 835 | 0.77 | 1.24 | Loop from MD 18 in Stevensville | Loop from MD 18 in Stevensville | — | — | Longest section |
| MD 835 | 0.26 | 0.42 | Loop from MD 273 near Rising Sun | Loop from MD 273 near Rising Sun | 01953-01-011953 | 01958-01-011958 | |
| MD 837 | 0.12 | 0.19 | MD 300 in Sudlersville | MD 313 in Sudlersville | — | — | |
| MD 843 | 0.16 | 0.26 | Spur from MD 63 near Williamsport | Spur from MD 63 near Williamsport | — | — | Longest section |
| MD 844 | 0.29 | 0.47 | Spur from MD 64 near Cavetown | Spur from MD 64 near Cavetown | — | — | |
| MD 845 | 1.23 | 1.98 | MD 34 in Keedysville | MD 34 in Keedysville | — | — | |
| MD 846 | 0.10 | 0.16 | Spur from MD 416 near Ringgold | Spur from MD 416 near Ringgold | — | — | Longest section |
| MD 847 | 0.14 | 0.23 | Spur from Welty Church Road near Smithsburg | Spur from Welty Church Road near Smithsburg | — | — | |
| MD 849 | 0.36 | 0.58 | MD 852 in Mexico | MD 482 near Mexico | — | — | |
| MD 850 | 1.75 | 2.82 | Winfield | MD 26 near Eldersburg | — | — | Longest section |
| MD 851 | 2.88 | 4.63 | MD 32 near Sykesville | MD 32 in Sykesville | — | — | |
| MD 852 | 3.72 | 5.99 | MD 31 in New Windsor | MD 31 near Westminster | — | — | Longest section |
| MD 853 | 0.37 | 0.60 | Parallels MD 194 between a pair of dead ends near Taneytown | Parallels MD 194 between a pair of dead ends near Taneytown | — | — | Longest section |
| MD 854 | 3.93 | 6.32 | Muller Road near Morgan Run NEA | MD 32 at Fenby | — | — | Longest section |
| MD 855 | 0.06 | 0.097 | Loop from MD 213 near Kennedyville | Loop from MD 213 near Kennedyville | 01956-01-011956 | current | Longest section |
| MD 856 | 0.10 | 0.16 | Loop from MD 298 in Lynch | Loop from MD 298 in Lynch | 01959-01-011959 | current | |
| MD 857 | 0.39 | 0.63 | Loop from MD 566 in Still Pond | Loop from MD 566 in Still Pond | 01959-01-011959 | 01987-01-011987 | |
| MD 858 | 1.00 | 1.61 | MD 67 in Rohrersville | MD 67 near Rohrersville | — | — | Longest section |
| MD 859 | 0.88 | 1.42 | MD 291 near Morgnec | Dead end east of Morgnec | 01963-01-011963 | 01987-01-011987 | Longest section |
| MD 863 | 0.20 | 0.32 | Loop from MD 5 in Charlotte Hall | Loop from MD 5 in Charlotte Hall | — | — | |
| MD 864 | 0.11 | 0.18 | Loop from MD 292 near Still Pond | Loop from MD 292 near Still Pond | 01968-01-011968 | current | |
| MD 868 | 0.07 | 0.11 | Spur from MD 236 at Budds Creek | Spur from MD 236 at Budds Creek | — | — | |
| MD 870 | 0.20 | 0.32 | Bowmans Farm Road in Frederick | MD 144 in Frederick | — | — | |
| MD 871 | 0.91 | 1.46 | MD 79 in Rosemont | MD 17 near Rosemont | — | — | Longest section |
| MD 872 | 0.33 | 0.53 | Spur from MD 180 near Petersville | Spur from MD 180 near Petersville | — | — | |
| MD 873 | 0.37 | 0.60 | Spur from US 15 Business near Emmitsburg | Spur from US 15 Business near Emmitsburg | — | 02016-01-012016 | |
| MD 874 | 0.14 | 0.23 | Former sections of MD 75 near New London | Former sections of MD 75 near New London | — | — | Longest section |
| MD 877 | 0.37 | 0.60 | Spur from MD 75 near New Market | Spur from MD 75 near New Market | — | — | |
| MD 878 | 0.10 | 0.16 | Spur from Broadfording Road in Hagerstown | Spur from Broadfording Road in Hagerstown | — | 02015-01-012015 | |
| MD 879 | 0.60 | 0.97 | Loop from MD 91 near Finksburg | Loop from MD 91 near Finksburg | — | — | Longest section |
| MD 889 | 0.10 | 0.16 | Spur from MD 137 in Hereford | Spur from MD 137 in Hereford | — | — | |
| MD 894 | 0.10 | 0.16 | MD 144 in Hancock | Limestone Road in Hancock | — | — | |
| MD 895 | — | — | US 29 in White Oak | MD 650 | — | 01999-01-011999 | |
| MD 896 | 0.21 | 0.34 | DE 896 near Newark, DE | PA 896 near Strickersville, PA | 01946-01-011946 | current | |
| MD 899 | 0.17 | 0.27 | Muddy Branch | Cherry Grove Drive near Gaithersburg | — | — | Longest section |
| MD 901 | — | — | MD 121 in Clarksburg | Montgomery County Correctional Facility | — | 01999-01-011999 | |
| MD 903 | 0.91 | 1.46 | US 40 Scenic at Sideling Hill | I-68 / US 40 at Sideling Hill | — | — | |
| MD 904 | 0.66 | 1.06 | Jim Bowers Road near Eldersburg | Morgan Run NEA | — | — | Longest section |
| MD 908 | 2.52 | 4.06 | MD 179 near Cape St. Claire | Skidmore | — | — | |
| MD 909 | 0.80 | 1.29 | Spur from MD 424 near Davidsonville | Spur from MD 424 near Davidsonville | — | — | |
| MD 910 | 0.59 | 0.95 | MD 144 in Hagerstown | US 40 in Hagerstown | — | — | Longest section |
| MD 911 | 0.21 | 0.34 | MD 355 in Rockville | MD 28 / MD 586 in Rockville | — | — | |
| MD 912 | 0.56 | 0.90 | Loop from MD 282 near Earleville | Loop from MD 282 near Earleville | 01967-01-011967 | 01979-01-011979 | Longest section |
| MD 913 | 0.19 | 0.31 | Spur from MD 267 in Charlestown | Spur from MD 267 in Charlestown | 01968-01-011968 | 01974-01-011974 | |
| MD 915 | 0.89 | 1.43 | Spur from MD 177 in Pasadena | Spur from MD 177 in Pasadena | — | — | Longest section |
| MD 917 | 0.09 | 0.14 | MD 175 in Jessup | Max Blob Park Road in Jessup | — | — | |
| MD 918 | 0.22 | 0.35 | MD 675 in Princess Anne | University of Maryland, Eastern Shore | — | — | |
| MD 920 | 0.97 | 1.56 | Loop from US 13 near Princess Anne | Loop from US 13 near Princess Anne | — | — | Longest section |
| MD 921 | 0.44 | 0.71 | Spur from US 113 near Ironshire | Spur from US 113 near Ironshire | — | — | Longest section |
| MD 922 | 0.24 | 0.39 | US 1 Business / MD 22 / MD 924 in Bel Air | US 1 Business in Bel Air | — | — | |
| MD 924 | 7.34 | 11.81 | MD 24 near Edgewood | US 1 / MD 24 near Bel Air | — | — | |
| MD 925 | 2.49 | 4.01 | Billingsley Road in White Plains | MD 5 Business in Waldorf | — | — | |
| MD 927 | 0.45 | 0.72 | Montrose Road through its interchange with I-270 near Rockville | Montrose Road through its interchange with I-270 near Rockville | — | — | Longest section |
| MD 928 | 0.19 | 0.31 | Loop from MD 28 at Norbeck | Loop from MD 28 at Norbeck | — | — | Longest section |
| MD 929 | 0.31 | 0.50 | Section of Randolph Road west from US 29 in Fairland | Section of Randolph Road west from US 29 in Fairland | — | — | Longest section |
| MD 931 | 0.38 | 0.61 | College Parkway in Cape St. Claire | Old Cape St. Claire Road in Cape St. Claire | — | — | Longest section |
| MD 932 | 0.55 | 0.89 | Ten Oaks Road near Glenelg | MD 32 near Glenelg | — | — | Longest section |
| MD 935 | 2.99 | 4.81 | MD 36 near Barton | MD 36 near Nikep | — | — | |
| MD 936 | 5.19 | 8.35 | Church Street in Midland | US 40 Alternate / MD 36 in Frostburg | — | — | |
| MD 937 | 1.53 | 2.46 | MD 135 in Westernport | MD 36 near Westernport | — | — | |
| MD 939 | 0.01 | 0.016 | Spur from MD 36 near Barton | Spur from MD 36 near Barton | — | — | |
| MD 940 | 1.48 | 2.38 | Red Run Boulevard in Owings Mills | MD 140 in Owings Mills | — | — | |
| MD 942 | 0.06 | 0.097 | Blue Bridge across the Potomac River in Cumberland | Blue Bridge across the Potomac River in Cumberland | — | — | |
| MD 943 | 0.59 | 0.95 | I-83 in Cockeysville | Beaver Dam Road in Cockeysville | — | — | |
| MD 944 | 2.26 | 3.64 | Mervell Dean Road near California | MD 235 in Hollywood | — | — | |
| MD 945 | 0.10 | 0.16 | Spur from MD 235 in Hollywood | Spur from MD 235 in Hollywood | — | — | |
| MD 946 | 0.61 | 0.98 | US 40 Alternate near Finzel | MD 546 in Finzel | — | — | |
| MD 948 | 0.62 | 1.00 | Spur from US 219 near Keyser's Ridge | Spur from US 219 near Keyser's Ridge | — | — | Longest segment |
| MD 949 | 0.56 | 0.90 | Spur from MD 658 in La Vale | Spur from MD 658 in La Vale | — | — | Longest segment |
| MD 950 | 0.42 | 0.68 | Lottsford Vista Road near Lanham | Cleary Lane near Lanham | — | — | Longest segment |
| MD 951 | 0.23 | 0.37 | Loop from MD 53 near Cresaptown | Loop from MD 53 near Cresaptown | — | — | |
| MD 952 | 0.31 | 0.50 | Hillcrest Drive at I-68 / US 40 / US 220 near Cumberland | Hillcrest Drive at I-68 / US 40 / US 220 near Cumberland | — | — | Longest segment |
| MD 953 | 3.53 | 5.68 | MD 193 near Glenn Dale | Amtrak's Northeast Corridor | — | — | |
| MD 954 | 0.20 | 0.32 | Choptank River | US 50 near Trappe | — | — | |
| MD 956 | 0.53 | 0.85 | US 220 near Pinto | WV 956 in Rocket Center, WV | — | — | |
| MD 958 | 0.21 | 0.34 | Spur from US 1 near Jessup | Spur from US 1 near Jessup | — | — | |
| MD 963 | 0.01 | 0.016 | Spur from Hill Road near Seat Pleasant | Spur from Hill Road near Seat Pleasant | — | — | |
| MD 964 | 0.10 | 0.16 | Spur from Red Top Road in Chillum | Spur from Red Top Road in Chillum | — | — | |
| MD 965 | 0.54 | 0.87 | Eastern Avenue in Washington, D.C. | Kenilworth Avenue near Cheverly | — | — | Longest section |
| MD 967 | 0.98 | 1.58 | MD 5 near Silver Hill | MD 414 in Silver Hill | — | — | Longest section |
| MD 968 | 0.05 | 0.080 | MD 193 in Greenbelt | National Guard Armory | — | — | |
| MD 969 | 0.11 | 0.18 | MD 168 in Linthicum | I-695 in Linthicum | — | — | Longest section |
| MD 972 | 0.43 | 0.69 | MD 458 in Suitland | Marlboro Pike in District Heights | — | — | |
| MD 973 | 0.06 | 0.097 | Spur from MD 459 in Cheverly | Spur from MD 459 in Cheverly | — | — | |
| MD 974 | 0.10 | 0.16 | Spur from MD 193 in Woodmore | Spur from MD 193 in Woodmore | — | — | |
| MD 975 | 0.06 | 0.097 | St. Barnabas Road in Oxon Hill | MD 414 in Oxon Hill | — | — | |
| MD 976 | 0.31 | 0.50 | Loop from MD 3 in Bowie | Loop from MD 3 in Bowie | — | — | Longest section |
| MD 977 | 0.48 | 0.77 | MD 202 in Largo | MD 214 in Largo | — | — | Longest section |
| MD 978 | 0.84 | 1.35 | Loop from MD 214 near Bowie | Loop from MD 214 near Bowie | — | — | Longest section |
| MD 979 | 0.07 | 0.11 | Main Street between the one-way pair of US 1 in Laurel | Main Street between the one-way pair of US 1 in Laurel | — | — | |
| MD 980 | 2.05 | 3.30 | Lyons Creek | Wrighton Road in Bristol | — | — | Longest section |
| MD 981 | 0.11 | 0.18 | Loop from MD 108 near Ellicott City | Loop from MD 108 near Ellicott City | — | — | |
| MD 983 | 1.02 | 1.64 | North Laurel | Old Scaggsville Road in North Laurel | 01963-01-011963 | 02017-01-012017 | Longest section |
| MD 984 | 0.22 | 0.35 | US 40 in Ellicott City | Normandy Drive in Ellicott City | — | — | |
| MD 985 | 0.55 | 0.89 | Spur from Rogers Avenue in Ellicott City | Spur from Rogers Avenue in Ellicott City | — | — | Longest section |
| MD 986 | 0.06 | 0.097 | Spur from Old Columbia Road in Columbia | Spur from Old Columbia Road in Columbia | — | — | |
| MD 990 | 0.01 | 0.016 | Spur from MD 177 near Jacobsville | Spur from MD 177 near Jacobsville | — | — | |
| MD 991 | 0.02 | 0.032 | Main Street Bridge over the Wicomico River in Salisbury | Main Street Bridge over the Wicomico River in Salisbury | — | — | |
| MD 992 | 0.74 | 1.19 | Spur from Hobbs Road near Salisbury | Spur from Hobbs Road near Salisbury | — | — | Longest section |
| MD 993 | 0.04 | 0.064 | Spur from US 1 Alternate in Lansdowne | Spur from US 1 Alternate in Lansdowne | — | — | |
| MD 995 | 0.50 | 0.80 | MD 170 near Hanover | BWI Rail Station | — | — | |
| MD 996 | 0.49 | 0.79 | MD 191 near Bethesda | end of state maintenance near Tammy Court | — | 01999-01-011999 | |
| MD 997 | 0.29 | 0.47 | Morris Tongue Drive near Millersville | Jabez Run near Millersville | — | — | Longest section |
| MD 998 | 0.08 | 0.13 | Spur from Star Point Lane in Burtonsville | Spur from Star Point Lane in Burtonsville | — | — | |
| MD 999 | 0.24 | 0.39 | Newport Road & Stewart Avenue | cul-de-sac | 02001-01-012001 | 02002-01-012002 | |