List of Interstate Highways

150px|thumb|right|The sign used to mark an interstate.
Primary Interstate Highways are the major interstate highways of the United States and have a one or two-digit route number.  Even (0, 2, 4, 6, or 8) route numbers are given to east/west routes, with the smaller numbered routes in the  south (I-10) and bigger numbered routes in the north (I-90).  Similarly, odd (1, 3, 5, 7, or 9) route numbers are given to north/south routes, with the smaller numbered routes in the west (I-5) and the bigger numbered routes in the east (I-95). Routes that end in a 0 or a 5 are major routes in the system. These Interstates generally go from coast to coast or from the bottom to the top of the U.S. For example, Interstate 5 goes from the Mexican Border at San Diego, California to the Canadian Border at Blaine, Washington. Likewise, Interstate 10, the southernmost cross-country Interstate Highway, goes from Santa Monica, California on the west coast to Jacksonville, Florida on the east coast. The longest Interstate Highway in the United States is Interstate 90.

There are five sets of numbers that are used more than once throughout the system; the highways whose numbers are used more than once are separated by big distances to avoid confusion. Below, these are made separate from each other by West and East.

Three-digit Interstates are spur or loop Interstates that usually are in big cities and areas outside of cities.  The last two digits of a three-digit Interstate are always the number of the route it is related to.  If the first digit is odd (1, 3, 5, 7, or 9), the Interstate is usually a spur route while if the first digit is even (2, 4, 6, 8, or 0), the Interstate is usually a loop route. 

Primary Interstates
A total of 69 primary Interstates are in the table below, with 43 of them having three-digit routes. The lengths in the table are as of December 31, 2013.

Routes ending in 0 or 5 are marked in  green, denoting an interstate major.

InterstateRoute, States Served & Associated routes(* not signposted as interstates) (sort by number of states served)Length(mi.)31x25px I-2Palmview, Texas (US-83) to Harlingen, Texas (I-69E / US-77)Texas Intrastate InterstateAssociated routes:  none46.8031x25px I-4Tampa, Florida (I-275) to Daytona Beach, Florida (I-95)Florida Intrastate InterstateAssociated routes:  none132.3031x25px I-5 San Ysidro, California (Mexico and MX-1) to Blaine, Washington (Canada and BC 99)3 States Served: CA, OR, WAAssociated routes: I-105, I-205, I-305*, I-405, I-505, I-605, I-705, I-8051,381.2931x25px I-8San Diego, California (Sunset Cliffs Blvd.) to Casa Grande, Arizona (I-10)2 States Served: CA, AZAssociated routes:  none348.25 31x25px I-10 Santa Monica, California (CA-1) to Jacksonville, Florida (I-95)8 States Served: CA, AZ, NM, TX, LA, MS, AL, FLAssociated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910*2,460.3431x25px I-11Arizona state line (US-93) to Henderson, Nevada (I-215 / I-515 / US-93 / US-95)1 State Served: Nevada. 1 Planned: ArizonaAssociated routes:  none22.8431x25px I-12Baton Rouge, Louisiana (I-10) to Slidell, Louisiana (I-10 / I-59)Louisiana Intrastate InterstateAssociated routes:  none85.5931x25px I-14Copperas Cove, Texas (US-190 / TX-9) to Belton, Texas (I-35 / US-190)Texas Intrastate InterstateAssociated routes:  I-214 (planned)24.80 31x25px I-15 San Diego, California (I-8/CA-15) to Sweetgrass, Montana (Canada and Hwy 4)6 States Served: CA, NV, AZ, UT, ID, MTAssociated routes: I-115, I-215, I-315*, I-5151,433.5231x25px I-16Macon, Georgia (I-75) to Savannah, Georgia (Montgomery St.)Georgia Intrastate InterstateAssociated route: I-516166.8131x25px I-17Phoenix, Arizona (I-10) to Flagstaff, Arizona (AZ-89A)Arizona Intrastate InterstateAssociated routes:  none145.7631x25px I-19Nogales, Arizona (Mexico and MX-15) to Tucson, Arizona (I-10)Arizona Intrastate InterstateAssociated routes:  none63.35 31x25px I-20 Kent, Texas (I-10) to Florence, South Carolina (I-95)6 States Served: TX, LA, MS, AL, GA, SCAssociated routes: I-220, I-520, I-8201,539.3831x25px I-22Memphis, Tennessee (I-55 & I-40) to Birmingham, Alabama  (I-65/US 31)2 States Served:  Mississippi, Alabama.  Planned:  TennesseeAssociated route: I-422 (planned)213.031x25px I-24Pulley's Mill, Illinois (I-57) to Chattanooga, Tennessee (I-75)4 States Served:  Illinois, Kentucky, Tennessee, GeorgiaAssociated route: I-124316.36 31x25px I-25 Las Cruces, New Mexico (I-10) to Buffalo, Wyoming (I-90)3 States Served:  New Mexico, Colorado, WyomingAssociated route: I-2251,062.7731x25px I-26Kingsport, Tennessee (US-11W) to Charleston, South Carolina (US-17)3 States Served:  Tennessee, North Carolina, South CarolinaAssociated routes: I-126, I-52634631x25px I-27Lubbock, Texas (US-87 and Loop 289) to Amarillo, Texas (I-40)Texas Intrastate InterstateAssociated routes:  none124.1331x25px I-29Kansas City, Missouri (I-35 & I-70) to Pembina, North Dakota (Canada and US 81 and PTH 29)4 States Served:  Missouri, Iowa, South Dakota, North DakotaAssociated routes: I-129, I-229755.51 31x25px I-30 Fort Worth, Texas (I-20) to North Little Rock, Arkansas (I-40)2 States Served:  Texas, ArkansasAssociated routes: I-430, I-530, I-630366.76 31x25px I-35 Laredo, Texas (Mexico) to Duluth, Minnesota (MN-61)6 States Served:  TX, OK, KS, MO, IA, MNAssociated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-6351,568.3831x25px I-37Corpus Christi, Texas (US-181) to San Antonio, Texas (I-35)Texas Intrastate InterstateAssociated routes:  none143.0031x25px I-39Normal, Illinois (I-55) to Wausau, Wisconsin (WIS 29 & US-51)2 States Served:  Illinois, WisconsinAssociated routes:  none306.14 31x25px I-40 Barstow, California (I-15) to Wilmington, North Carolina (NC-132)8 States Served:  CA, AZ, NM, TX, OK, AR, TN, NCAssociated routes: I-140, I-240, I-440, I-540, I-8402,554.1031x25px I-41Russell, Illinois (I-94 and US-41) to Howard, Wisconsin (I-43, US-41 and US-141)2 States Served:  Illinois, WisconsinAssociated routes:  none176.3331x25px I-43Beloit, Wisconsin (I-39 and I-90) to Howard, Wisconsin (I-41, US-41 and US-141)Wisconsin Intrastate InterstateAssociated routes:  none191.5531x25px I-44Wichita Falls, Texas (US-277, US-281, and US-287) to St. Louis, Missouri (I-55)3 States Served:  Texas, Oklahoma, MissouriAssociated routes: I-244, I-444*633.79 31x25px I-45 Galveston, Texas (TX-87) to Dallas, Texas (I-30)Texas Intrastate InterstateAssociated route: I-345*284.9131x25px I-49Lafayette, Louisiana (I-10) to Kansas City, Missouri (I-435 / US-50, I-470, and US-71)3 States Served:  Louisiana, Arkansas, Missouri. 1 Planned: Texas Associated routes:  none528.02 31x25px I-55 Laplace, Louisiana (I-10) to Chicago, Illinois (US-41, Lake Shore Drive)6 States Served:  LA, MS, TN, AR, MO, ILAssociated routes: I-155, I-255, I-355964.2531x25px I-57Miner, Missouri (I-55) to Chicago, Illinois (I-94)2 States Served:  Missouri, IllinoisAssociated routes:  none386.1231x25px I-59Slidell, Louisiana (I-10 & I-12) to Lookout Mountain, Georgia (I-24)4 States Served:  Louisiana, Mississippi, Alabama, GeorgiaAssociated routes: I-359, I-459, I-759445.2331x25px I-64Wentzville, Missouri (I-70) to Chesapeake, Virginia (I-264 & I-664)6 States Served:  MO, IL, IN, KY, WV, VAAssociated routes: I-164, I-264 (KY), I-264 (VA), I-464, I-564, I-664953.74 31x25px I-65 Mobile, Alabama (I-10) to Gary, Indiana (I-90)4 States Served:  Alabama, Tennessee, Kentucky, IndianaAssociated routes: I-165, I-265,  I-465, I-565, I-865887.3031x25px I-66Middletown, Virginia (I-81) to Washington, D.C. (US-29)2 States Served:  Virginia, District of ColumbiaAssociated routes:  none76.2831x25px I-68Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70)2 States Served:  West Virginia, MarylandAssociated routes:  none113.1531x25px I-69Victoria, Texas (I-69E / US 77 future & I-69W / US 59 future) to Port Huron, Michigan (Canada and Hwy 402)6 States Served:  TX, MS, TN, KY, IN, MI.  2 Planned:  LA, ARAssociated route: I-469 I-269  future, I-369 planned705.40 31x25px I-70 Cove Fort, Utah (I-15) to Baltimore, Maryland (I-695)10 States Served:  UT, CO, KS, MO, IL, IN, OH, WV, PA, MDAssociated routes: I-170, I-270, I-370, I-470, I-6702,153.1331x25px I-71Louisville, Kentucky (I-64) to Cleveland, Ohio (I-90)2 States Served:  Kentucky, OhioAssociated routes: I-271, I-471345.5731x25px I-72Hannibal, Missouri (US-61) to Champaign, Illinois (I-57)2 States Served:  Missouri, IllinoisAssociated route: I-172179.2931x25px I-73Candor, North Carolina (US-220) to Greensboro, North Carolina (I-40 & I-85)North Carolina Intrastate InterstateAssociated routes:  none12.2731x25px I-74West Bettendorf, Iowa (I-80) to Cincinnati, Ohio (I-75)7 States Served:  IA, IL, IN, OH, WV, VA, NCAssociated route: I-474416.7131x25px I-74East Cana, Virginia (I-77) to Mount Airy, North Carolina (US-52)2 States Served:  VA, NC.  Planned:  WVAssociated routes:  none12.10 31x25px I-75 Hialeah, Florida (FL-826) to Sault Ste. Marie, Michigan (Canada)6 States Served: FL, GA, TN, KY, OH, MIAssociated routes: I-175, I-275, I-375, I-475, I-575, I-6751,786.4731x25px I-76West Denver, Colorado (I-70) to Big Springs, Nebraska (I-80)2 States Served:  Colorado, NebraskaAssociated routes:  none187.3431x25px I-76East Westfield Center, Ohio (I-71) to Camden, New Jersey (I-295)3 States Served:  Ohio, Pennsylvania, New JerseyAssociated routes: I-176, I-276, I-376, I-476, I-676434.3631x25px I-77Columbia, South Carolina (I-26) to Cleveland, Ohio (I-90)5 States Served:  South Carolina, North Carolina, Virginia, West Virginia, OhioAssociated routes: I-277610.1031x25px I-78Union Twp., Pennsylvania (I-81) to New York, New York3 States Served:  Pennsylvania, New Jersey, New YorkAssociated routes: I-278, I-478*, I-678, I-878*143.5631x25px I-79Charleston, West Virginia (I-77) to Erie, Pennsylvania (PA-5)2 States Served:  West Virginia, PennsylvaniaAssociated routes: I-279, I-579343.24 31x25px I-80 San Francisco, California (U.S. Route 101) to Fort Lee, New Jersey (I-95)11 States Served:  CA, NV, UT, WY, NE, IA, IL, IN, OH, PA, NJAssociated routes: I-180, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-9802,899.5431x25px I-81Dandridge, Tennessee (I-40) to Fisher's Landing, New York (Canada)6 States Served:  TN, VA, WV, MD, PA, NYAssociated routes: I-181, I-381, I-481, I-581854.8931x25px I-82Ellensburg, Washington (I-90) to Hermiston, Oregon (I-84)2 States Served:  Washington, OregonAssociated route: I-182143.5831x25px I-83Baltimore, Maryland to Harrisburg, Pennsylvania (I-81)2 States Served:  Maryland, PennsylvaniaAssociated route: I-28385.331x25px I-84West Portland, Oregon (I-5) to Echo, Utah (I-80)3 States Served:  Oregon, Idaho, UtahAssociated route: I-184769.6231x25px I-84East Scranton, Pennsylvania (I-81) to Sturbridge, Massachusetts (I-90)4 States Served:  Pennsylvania, New York, Connecticut, MassachusettsAssociated routes: I-384, I-684232.4 31x25px I-85 Montgomery, Alabama (I-65) to Petersburg, Virginia (I-95)5 States Served:  Alabama, Georgia, South Carolina, North Carolina, VirginiaAssociated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-985668.7531x25px I-86West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15)Idaho Intrastate InterstateAssociated routes:  none62.8531x25px I-86East Erie, Pennsylvania (I-90) to Elmira, New York (NY-17)2 States Served:  Pennsylvania, New YorkAssociated routes:  none183.5631x25px I-87 South Raleigh, North Carolina (I-40 , I-440, and US 64) to Wendell, North Carolina (US 64 and US 264) 1 State Served: North Carolina. 1 Planned: Virginia Associated routes: I-58712.931x25px I-87 North New York, New York (I-278) to Champlain, New York (Canada)New York Intrastate InterstateAssociated routes: I-287, I-587, I-787333.4931x25px I-88West Barstow, Illinois (I-80) to Chicago, Illinois (I-290)Illinois Intrastate InterstateAssociated routes:  none140.631x25px I-88East Binghamton, New York (I-81) to Schenectady, New York (I-90)New York Intrastate InterstateAssociated routes:  none117.7531x25px I-89Bow, New Hampshire (I-93) to Highgate Springs, Vermont (Canada)2 States Served:  New Hampshire, VermontAssociated route: I-189191.12 31x25px I-90 Seattle, Washington (WA-519) to Boston, Massachusetts (MA-1A)13 States Served:  WA, ID, MT, WY, SD, MN, WI, IL, IN, OH, PA, NY, MAAssociated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-9903,020.5431x25px I-91New Haven, Connecticut/North Haven, Connecticut (I-95) to Derby Line, Vermont (Canada)3 States Served:  Connecticut, Massachusetts, VermontAssociated routes: I-291, I-391, I-691290.3731x25px I-93Canton, Massachusetts (I-95) to St. Johnsbury, Vermont (I-91)3 States Served:  Massachusetts, New Hampshire, VermontAssociated routes: I-293, I-393189.9531x25px I-94Billings, Montana (I-90) to Port Huron, Michigan (Canada)7 States Served:  MT, ND, MN, WI, IL, IN, MIAssociated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-8941,585.20 31x25px I-95 Miami, Florida (US-1) to Houlton, Maine (Canada)15 States Served: FL, GA, SC, NC, VA, MD, DE, PA, NJ, NY, CT, RI, MA, NH, MEAssociated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-8951,925.7431x25px I-96Muskegon, Michigan (US-31) to Detroit, Michigan (I-75)Michigan Intrastate InterstateAssociated routes: I-196, I-296*, I-496, I-696192.0631x25px I-97Annapolis, Maryland (US-50) to Baltimore, Maryland (I-695)Maryland Intrastate InterstateAssociated routes:  none17.6231x25px I-99Bedford, Pennsylvania (I-76) to Painted Post, New York (I-86)Unfinished Pennsylvania section: Bellefonte, Pennsylvania (I-80) to New York border near Lawrenceville, Pennsylvania (US 15)2 states served: Pennsylvania, New YorkAssociated routes: none 98.86

Interstates outside of the mainland
Interstate Highways are not only in the 48 states of the United States that border, but there are also Interstates in Hawaii, Alaska, and Puerto Rico.

Hawaiian Interstates
The Interstate Highways in the island of Oahu, Hawaii are signed with the normal Interstate shield, with the letter "H-" added before the number. They are fully controlled-access routes built to the same standards as the Interstate routes in the main part of the United States. These are marked and considered interstates.

InterstateRouteLength (miles)31x25px H-1 Kapolei, Hawaii (HI-93) to Honolulu, Hawaii (HI-72)Associated route: H-20127.1631x25px H-2 Pearl City, Hawaii (H-1) to Wahiawa, Hawaii (HI-99) 8.3331x25px H-3 Halawa, Hawaii (H-1 & H-201) to Marine Corps Base Hawaii 15.32

Alaska and Puerto Rico
The Federal Highway Administration gives money to four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System.  However, these routes do not have to meet the same standards as the Interstate routes in the main part of the United States. Note that these are not marked and considered as interstates, but state and territory highways.

Alaska
200px|thumb|right|Map of the Interstates in Alaska
Alaska's Interstates do not have signs to mark them, although they all have state highway numbers that are not the same as the Interstate numbers.

31x25px Interstate A-1
31x25px Interstate A-2
31x25px Interstate A-3
31x25px Interstate A-4

Puerto Rico
200px|thumb|right|Map of the Interstates in Puerto Rico
Like Alaska, Puerto Rico signs its Interstates as territorial routes, and the numbers are not the same as their official Interstate designations.  Many of the territory's routes are freeway-standard toll roads.

33px Interstate PR-1
33px Interstate PR-2
33px Interstate PR-3

Related pages
List of auxiliary Interstate Highways
List of business routes of the Interstate Highway System
List of intrastate Interstate Highways

References

Other websites
Alaska Roads - Interstate ends photos
Puerto Rico road photos
The Dwight D. Eisenhower National System of Interstate and Defense Highways Route Log and Finder List
3-digit Interstate Highways

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Category:Lists of roads in the United States
Category:United States-related lists