# List of Maryland state historical markers in Harford County

This is a list of the Maryland state historical markers in Harford County.
This is intended to be a complete list of the official state historical markers placed in Harford County, Maryland by the Maryland Historical Trust (MHT). The locations of the historical markers, as well as the latitude and longitude coordinates as provided by the MHT's database, are included below. There are currently 51 historical markers located in Harford County.
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| Marker title | City | Location |
| Aberdeen Proving Ground | Aberdeen, Maryland | US 40 (median), west of MD 132 39°30′26.40″N 76°09′53.68″W﻿ / ﻿39.5073333°N 76.1649111°W﻿ / 39.5073333; -76.1649111﻿ (Aberdeen Proving Ground) |
| Bel Air - County Seat of Harford County | Bel Air, Maryland | Main Street at Office Street and Courtland Street 39°32′07″N 76°20′58″W﻿ / ﻿39.53528°N 76.34944°W﻿ / 39.53528; -76.34944﻿ (Bel Air - County Seat of Harford County) |
| Berkley Crossroads | Darlington, Maryland | 2398 Castleton Rod (MD 263) southbound, N of Berkley Rd. 39°39′42″N 76°12′33″W﻿ / ﻿39.66167°N 76.20917°W﻿ / 39.66167; -76.20917﻿ (Berkley Crossroads) |
| Black Horse Tavern | Blackhorse, Maryland | MD 23 (southbound) at MD 138 39°37′29″N 76°33′02″W﻿ / ﻿39.62472°N 76.55056°W﻿ / 39.62472; -76.55056﻿ (Black Horse Tavern) |
| Calvary United Methodist Church | Churchville, Maryland | MD 136 (northbound), 1321 Calvary Road 39°31′38.61″N 76°15′47.46″W﻿ / ﻿39.5273917°N 76.2631833°W﻿ / 39.5273917; -76.2631833﻿ (Calvary United Methodist Church) |
| Capt. Angus Greme | Churchville, Maryland | MD 136 (southbound) at Trappe Road 39°37′01″N 76°15′30″W﻿ / ﻿39.61694°N 76.25833°W﻿ / 39.61694; -76.25833﻿ (Capt. Angus Greme) |
| Captain John Smith | Abingdon, Maryland | US 40 (eastbound) west of Otter Point Road, in park overlooking Otter Point Creek 39°26′59.43″N 76°16′43.55″W﻿ / ﻿39.4498417°N 76.2787639°W﻿ / 39.4498417; -76.2787639﻿ (Captain John Smith) |
| Churchville | Churchville, Maryland | MD 22 at MD 136, northeast corner 39°33′35″N 76°15′07″W﻿ / ﻿39.55972°N 76.25194°W﻿ / 39.55972; -76.25194﻿ (Churchville) |
| Colony of Maryland | Aberdeen, Maryland | I-95, Maryland House Rest Stop 39°29′49″N 76°13′56″W﻿ / ﻿39.49694°N 76.23222°W﻿ / 39.49694; -76.23222﻿ (Colony of Maryland) |
| Concord Point Light Station | Havre de Grace, Maryland | Concord and Lafayette Streets 39°32′27″N 76°05′06″W﻿ / ﻿39.54083°N 76.08500°W﻿ / 39.54083; -76.08500﻿ (Concord Point Light Station) |
| Conowingo | Conowingo, Maryland | US 1 (southbound), 0.25 mile south of dam 39°39′18″N 76°10′48″W﻿ / ﻿39.65500°N 76.18000°W﻿ / 39.65500; -76.18000﻿ (Conowingo) |
| Constant Friendship | Abingdon, Maryland | Northbound MD 928, N of Porter Dr. 39°28′13.4″N 76°18′34.3″W﻿ / ﻿39.470389°N 76.309528°W﻿ / 39.470389; -76.309528﻿ (Constant Friendship) |
| ENIAC | Aberdeen, Maryland | MD 22 between MD 7 and gate to Aberdeen Proving Ground 39°30′23.22″N 76°09′12″W﻿ / ﻿39.5064500°N 76.15333°W﻿ / 39.5064500; -76.15333﻿ (ENIAC) |
| George Washington Traveled This Road | Havre de Grace, Maryland | St. John Street at Green Street 39°32′58.15″N 76°05′22.79″W﻿ / ﻿39.5494861°N 76.0896639°W﻿ / 39.5494861; -76.0896639﻿ (George Washington Traveled This Road) |
| George Washington Traveled This Road | Havre de Grace, Maryland | Union Avenue at Franklin Street, southwest corner 39°33′02.60″N 76°05′30.62″W﻿ / ﻿39.5507222°N 76.0918389°W﻿ / 39.5507222; -76.0918389﻿ (George Washington Traveled This Road) |
| George Washington Traveled This Road | Havre de Grace, Maryland | Union Avenue at Revolution, north of northwest corner 39°32′37.27″N 76°05′29.75″W﻿ / ﻿39.5436861°N 76.0915972°W﻿ / 39.5436861; -76.0915972﻿ (George Washington Traveled This Road) |
| Hall's Cross Roads | Aberdeen, Maryland | MD 132 at E. Bel Air Avenue, southeast corner 39°30′27.36″N 76°09′35.01″W﻿ / ﻿39.5076000°N 76.1597250°W﻿ / 39.5076000; -76.1597250﻿ (Hall's Cross Roads) |
| Harford Town or Bush | Bush, Maryland | MD 7 (westbound) at Bush Road, just west of bridge over Bynum Run 39°28′17.42″N 76°16′02.06″W﻿ / ﻿39.4715056°N 76.2672389°W﻿ / 39.4715056; -76.2672389﻿ (Harford Town or Bush) |
| Harry Gilmor's Raid | Stockton, Maryland | MD 152 (southbound) at Old Joppa Road 39°28′35″N 76°22′49″W﻿ / ﻿39.47639°N 76.38028°W﻿ / 39.47639; -76.38028﻿ (Harry Gilmor's Raid) |
| Havre de Grace Racetrack | Havre de Grace, Maryland | MD 7 (Old Post Road/ Revolution Street) at Old Bay Lane 39°32′12.87″N 76°06′43.93″W﻿ / ﻿39.5369083°N 76.1122028°W﻿ / 39.5369083; -76.1122028﻿ (Havre de Grace Racetrack) |
| Havre de Grace War of 1812 | Havre de Grace, Maryland | Lafayette Street at Concord Street (in park) 39°32′26″N 76°05′05″W﻿ / ﻿39.54056°N 76.08472°W﻿ / 39.54056; -76.08472﻿ (Havre de Grace War of 1812) |
| Indian Spring | Churchville, Maryland | MD 136 (east side), 2.0 miles south of MD 1 39°36′38″N 76°15′37″W﻿ / ﻿39.61056°N 76.26028°W﻿ / 39.61056; -76.26028﻿ (Indian Spring) |
| Jerusalem Mills | Jerusalem, Maryland | Jerusalem Road at Little Gunpowder Bridge 39°27′44″N 76°23′28″W﻿ / ﻿39.46222°N 76.39111°W﻿ / 39.46222; -76.39111﻿ (Jerusalem Mills) |
| Joppa Town | Joppatowne, Maryland | Bridge Drive and Anchor Drive 39°24′23.1″N 76°21′47.82″W﻿ / ﻿39.406417°N 76.3632833°W﻿ / 39.406417; -76.3632833﻿ (Joppa Town) |
| Ladew Topiary Gardens and Pleasant Valley House | Jarrettsville, Maryland | MD 146 (northbound), 0.8 mile south of MD 152, north of Pocock Road 39°34′47.02″N 76°30′54.09″W﻿ / ﻿39.5797278°N 76.5150250°W﻿ / 39.5797278; -76.5150250﻿ (Ladew Topiary Gardens and Pleasant Valley House) |
| LaFayette - at Col. Rigbie's House | Darlington vicinity, Maryland | MD 623 (Castleton Road), approximately 1500 feet south of Berkley Road 39°39′28.5″N 76°12′23.9″W﻿ / ﻿39.657917°N 76.206639°W﻿ / 39.657917; -76.206639﻿ (LaFayette - at Col. Rigbie's House) |
| Medical Hall | Churchville, Maryland | Northwest corner of MD Route 22 and Thomas Run Road 39°33′18.9072″N 76°17′11.99″W﻿ / ﻿39.555252000°N 76.2866639°W﻿ / 39.555252000; -76.2866639﻿ (Medical Hall) |
| Old Post Road Established 1666 - Cokesbury College | Abingdon, Maryland | MD 7 (eastbound) at Cokesbury Road 39°27′40.44″N 76°16′46.11″W﻿ / ﻿39.4612333°N 76.2794750°W﻿ / 39.4612333; -76.2794750﻿ (Old Post Road Established 1666 - Cokesbury College) |
| Old Post Road Established 1666 - Count Rochambeau's | Havre de Grace, Maryland | Lewis Lane (northbound), north of MD 7 39°32′33″N 76°06′07″W﻿ / ﻿39.54250°N 76.10194°W﻿ / 39.54250; -76.10194﻿ (Old Post Road Established 1666 - Count Rochambeau's) |
| Old Post Road Established 1666 - Gov. William Paca | Edgewood, Maryland | MD 7 (northbound), north of MD 24 39°26′58″N 76°17′47″W﻿ / ﻿39.44944°N 76.29639°W﻿ / 39.44944; -76.29639﻿ (Old Post Road Established 1666 - Gov. William Paca) |
| Old Post Road Established 1666 - Spesutia P.E. Church | Aberdeen, Maryland | MD 7 (Old Philadelphia Road) at MD 159 (Perryman Road) 39°29′16.99″N 76°11′27.76″W﻿ / ﻿39.4880528°N 76.1910444°W﻿ / 39.4880528; -76.1910444﻿ (Old Post Road Established 1666 - Spesutia P.E. Church) |
| Old Post Road Established 1666 - Susquehanna Lower Ferry | Havre de Grace, Maryland | St. John Street at Warren Street 39°33′06.18″N 76°05′29.58″W﻿ / ﻿39.5517167°N 76.0915500°W﻿ / 39.5517167; -76.0915500﻿ (Old Post Road Established 1666 - Susquehanna Lower Ferry) |
| Olney | Joppa, Maryland | Old Joppa Road (eastbound), east of MD 152 39°28′46″N 76°22′31″W﻿ / ﻿39.47944°N 76.37528°W﻿ / 39.47944; -76.37528﻿ (Olney) |
| Peach Bottom Slate Region | Whiteford, Maryland | on MD 165 north of MD 136 39°42′48.94″N 76°20′51.56″W﻿ / ﻿39.7135944°N 76.3476556°W﻿ / 39.7135944; -76.3476556﻿ (Peach Bottom Slate Region) |
| Prospect School | Havre de Grace, Maryland | MD 161 at Green Spring Rd. 39°35′51.1″N 76°11′28.8″W﻿ / ﻿39.597528°N 76.191333°W﻿ / 39.597528; -76.191333﻿ (Prospect School) |
| Rochambeau Plaza | Havre de Grace, Maryland | Washington Street at St. John Street and Green Street 39°32′58.14″N 76°05′22.92″W﻿ / ﻿39.5494833°N 76.0897000°W﻿ / 39.5494833; -76.0897000﻿ (Rochambeau Plaza) |
| Rock Run | Rock Run, Maryland | Rock Run Road, 100 yds west of Stafford Road, Rock Run State Park 39°36′28.15″N 76°08′37.84″W﻿ / ﻿39.6078194°N 76.1438444°W﻿ / 39.6078194; -76.1438444﻿ (Rock Run) |
| Rock Run Landing | Havre de Grace, Maryland | Rock Run Road at Stafford Road 39°36′30″N 76°08′35″W﻿ / ﻿39.60833°N 76.14306°W﻿ / 39.60833; -76.14306﻿ (Rock Run Landing) |
| Saint Ignatius Church Hickory, Maryland | Bel Air, Maryland | US 1 Business, south of Jarrettsville Road 39°34′24″N 76°21′15″W﻿ / ﻿39.57333°N 76.35417°W﻿ / 39.57333; -76.35417﻿ (Saint Ignatius Church Hickory, Maryland) |
| Site of "Old Baltimore" | , Maryland | Head of Bush River on US 40 39°23′58.98″N 76°14′13.02″W﻿ / ﻿39.3997167°N 76.2369500°W﻿ / 39.3997167; -76.2369500﻿ (Site of "Old Baltimore") |
| Site of Old Baltimore | Abingdon, Maryland | US 40 (eastbound) in park overlooking Otter Point Creek, west of Otter Point Road 39°26′59.44″N 76°16′43.30″W﻿ / ﻿39.4498444°N 76.2786944°W﻿ / 39.4498444; -76.2786944﻿ (Site of Old Baltimore) |
| Sophia's Dairy | Belcamp, Maryland | US 40 (southbound), north of MD 543 (Riverside Pkway) 39°28′18.72″N 76°13′58.62″W﻿ / ﻿39.4718667°N 76.2329500°W﻿ / 39.4718667; -76.2329500﻿ (Sophia's Dairy) |
| Spesutia Church | Perryman, Maryland | MD 159 (southbound), south of Spesutia Road 39°28′24″N 76°12′14″W﻿ / ﻿39.47333°N 76.20389°W﻿ / 39.47333; -76.20389﻿ (Spesutia Church) |
| Spesutia Island | Aberdeen, Maryland | Spesutia Road at Woodpecker Point (at small roadside park) 39°28′31.20″N 76°05′54.40″W﻿ / ﻿39.4753333°N 76.0984444°W﻿ / 39.4753333; -76.0984444﻿ (Spesutia Island) |
| State of Maryland | Aberdeen, Maryland | I-95, Maryland House Rest Stop 39°29′50″N 76°13′54″W﻿ / ﻿39.49722°N 76.23167°W﻿ / 39.49722; -76.23167﻿ (State of Maryland) |
| Susquehanna River Crossing | Havre de Grace, Maryland | MD 7/N. Union Ave., south of Otsego St., at David R. Craig Park 39°33′09.35″N 76°05′30.02″W﻿ / ﻿39.5525972°N 76.0916722°W﻿ / 39.5525972; -76.0916722﻿ (Susquehanna River Crossing) |
| The Bush Declaration Harford Town | Bush, Maryland | MD 7 (westbound), east of Bush Road 39°28′22″N 76°15′57″W﻿ / ﻿39.47278°N 76.26583°W﻿ / 39.47278; -76.26583﻿ (The Bush Declaration Harford Town) |
| The General's Highway | Aberdeen, Maryland | NE corner of US Rte 40 (Pulaski Hwy) and W. Belair Ave. 39°30′34.9338″N 76°09′48.8124″W﻿ / ﻿39.509703833°N 76.163559000°W﻿ / 39.509703833; -76.163559000﻿ (The General's Highway) |
| The Hays House | Bel Air, Maryland | 324 Kenmore Avenue 39°31′57.20″N 76°20′49.48″W﻿ / ﻿39.5325556°N 76.3470778°W﻿ / 39.5325556; -76.3470778﻿ (The Hays House) |
| The Lock House | Havre de Grace, Maryland | Park Drive at Conesteo Street 39°33′22.00″N 76°05′40.00″W﻿ / ﻿39.5561111°N 76.0944444°W﻿ / 39.5561111; -76.0944444﻿ (The Lock House) |
| Tudor Hall | Bel Air, Maryland | MD 22 (southbound) at Tudor Lane 39°33′00″N 76°18′02″W﻿ / ﻿39.55000°N 76.30056°W﻿ / 39.55000; -76.30056﻿ (Tudor Hall) |