List of Interstate Highways

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Interstate Highways in the 48 states that border each other. Purple routes are currently built and open freeways, blue are currently open spur routes, and green is proposed routes, future roads, or those being built.
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 (2, 4, 6, 8, or 0) 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).

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[change | change source]

There are 66 primary Interstates that are in the table below, with 43 of them having three-digit routes. The lengths in the table are as of October 31, 2002.

Routes ending in 0 or 5 are marked in green.

Interstate
Route, States Served & Associated routes
(* not signposted as interstates) (sort by number of states served)
Length[1]
(mi.)
I-4.svg I-4 Tampa, Florida (I-275) to Daytona Beach, Florida (I-95)
Florida Intrastate Interstate
Associated routes: none
132.30
I-5.svg I-5 San Ysidro, California (Mexico and MX-1) to Blaine, Washington (Canada and BC 99)
3 States Served: CA, OR, WA
Associated routes: I-105, I-205, I-305*, I-405, I-505, I-605, I-705, I-805
1,381.29
I-8.svg I-8 San Diego, California (Sunset Cliffs Blvd.) to Casa Grande, Arizona (I-10)
2 States Served: CA, AZ
Associated routes: none
348.25
I-10.svg I-10 Santa Monica, California (CA-1) to Jacksonville, Florida (I-95)
8 States Served: CA, AZ, NM, TX, LA, MS, AL, FL
Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910*
2,460.34
I-12.svg I-12 Baton Rouge, Louisiana (I-10) to Slidell, Louisiana (I-10 / I-59)
Louisiana Intrastate Interstate
Associated routes: none
85.59
I-15.svg I-15 San Diego, California (I-8/CA-15) to Sweetgrass, Montana (Canada and Hwy 4)
6 States Served: CA, NV, AZ, UT, ID, MT
Associated routes: I-115, I-215, I-315*, I-515
1,433.52
I-16.svg I-16 Macon, Georgia (I-75) to Savannah, Georgia (Montgomery St.)
Georgia Intrastate Interstate
Associated route: I-516
166.81
I-17.svg I-17 Phoenix, Arizona (I-10) to Flagstaff, Arizona (AZ-89A)
Arizona Intrastate Interstate
Associated routes: none
145.76
I-19.svg I-19 Nogales, Arizona (Mexico and MX-15) to Tucson, Arizona (I-10)
Arizona Intrastate Interstate
Associated routes: none
63.35
I-20.svg I-20 Kent, Texas (I-10) to Florence, South Carolina (I-95)
6 States Served: TX, LA, MS, AL, GA, SC
Associated routes: I-220, I-520, I-820
1,539.38
I-22.svg I-22 Memphis, Tennessee (I-55 & I-40) to Birmingham, Alabama (I-65/US 31)
2 States Served: Mississippi, Alabama. Planned: Tennessee
Associated route: I-422 (planned)
213.0
I-24.svg I-24 Pulley's Mill, Illinois (I-57) to Chattanooga, Tennessee (I-75)
4 States Served: Illinois, Kentucky, Tennessee, Georgia
Associated route: I-124
316.36
I-25.svg I-25 Las Cruces, New Mexico (I-10) to Buffalo, Wyoming (I-90)
3 States Served: New Mexico, Colorado, Wyoming
Associated route: I-225
1,062.77
I-26.svg I-26 Kingsport, Tennessee (US-11W) to Charleston, South Carolina (US-17)
3 States Served: Tennessee, North Carolina, South Carolina
Associated routes: I-126, I-526
346[2]
I-27.svg I-27 Lubbock, Texas (US-87 and Loop 289) to Amarillo, Texas (I-40)
Texas Intrastate Interstate
Associated routes: none
124.13
I-29.svg I-29 Kansas 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 Dakota
Associated routes: I-129, I-229
755.51
I-30.svg I-30 Fort Worth, Texas (I-20) to North Little Rock, Arkansas (I-40)
2 States Served: Texas, Arkansas
Associated routes: I-430, I-530, I-630
366.76
I-35.svg I-35 Laredo, Texas (Mexico) to Duluth, Minnesota (MN-61)
6 States Served: TX, OK, KS, MO, IA, MN
Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635
1,568.38
I-37.svg I-37 Corpus Christi, Texas (US-181) to San Antonio, Texas (I-35)
Texas Intrastate Interstate
Associated routes: none
143.00
I-39.svg I-39 Normal, Illinois (I-55) to Wausau, Wisconsin (WIS 29 & US-51)
2 States Served: Illinois, Wisconsin
Associated routes: none
306.14
I-40.svg I-40 Barstow, California (I-15) to Wilmington, North Carolina (NC-132)
8 States Served: CA, AZ, NM, TX, OK, AR, TN, NC
Associated routes: I-140, I-240, I-440, I-540, I-840
2,554.10
I-43.svg I-43 Beloit, Wisconsin (I-39 and I-90) to Howard, Wisconsin (US-41 and US-141)
Wisconsin Intrastate Interstate
Associated routes: none
191.55
I-44.svg I-44 Wichita Falls, Texas (US-277, US-281, and US-287) to St. Louis, Missouri (I-55)
3 States Served: Texas, Oklahoma, Missouri
Associated routes: I-244, I-444*
633.79
I-45.svg I-45 Galveston, Texas (TX-87) to Dallas, Texas (I-30)
Texas Intrastate Interstate
Associated route: I-345*
284.91
I-49.svg I-49 Lafayette, Louisiana (I-10) to Shreveport, Louisiana (I-20)
Louisiana Intrastate Interstate
Associated routes: none
208.25
I-55.svg I-55 Laplace, Louisiana (I-10) to Chicago, Illinois (US-41, Lake Shore Drive)
6 States Served: LA, MS, TN, AR, MO, IL
Associated routes: I-155, I-255, I-355
964.25
I-57.svg I-57 Miner, Missouri (I-55) to Chicago, Illinois (I-94)
2 States Served: Missouri, Illinois
Associated routes: none
386.12
I-59.svg I-59 Slidell, Louisiana (I-10 & I-12) to Lookout Mountain, Georgia (I-24)
4 States Served: Louisiana, Mississippi, Alabama, Georgia
Associated routes: I-359, I-459, I-759
445.23
I-64.svg I-64 Wentzville, Missouri (I-70) to Chesapeake, Virginia (I-264 & I-664)
6 States Served: MO, IL, IN, KY, WV, VA
Associated routes: I-164, I-264, I-464, I-564, I-664
953.74
I-65.svg I-65 Mobile, Alabama (I-10) to Gary, Indiana (I-90)
4 States Served: Alabama, Tennessee, Kentucky, Indiana
Associated routes: I-165, I-265, I-465, I-565, I-865
887.30
I-66.svg I-66 Middletown, Virginia (I-81) to Washington, D.C. (US-29)
2 States Served: Virginia, District of Columbia
Associated routes: none
76.28
I-68.svg I-68 Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70)
2 States Served: West Virginia, Maryland
Associated routes: none
113.15
I-69.svg I-69 Indianapolis, Indiana (I-465) to Port Huron, Michigan (Canada and Hwy 402)
4 States Served: MS, TN, IN, MI. 5 Planned: TX, LA, AR, MS, KY
Associated route: I-469 I-269 future, I-369 planned
355.81
I-70.svg I-70 Cove Fort, Utah (I-15) to Baltimore, Maryland (I-695)
10 States Served: UT, CO, KS, MO, IL, IN, OH, WV, PA, MD
Associated routes: I-170, I-270, I-370, I-470, I-670
2,153.13
I-71.svg I-71 Louisville, Kentucky (I-64) to Cleveland, Ohio (I-90)
2 States Served: Kentucky, Ohio
Associated routes: I-271, I-471
345.57
I-72.svg I-72 Hannibal, Missouri (US-61) to Champaign, Illinois (I-57)
2 States Served: Missouri, Illinois
Associated route: I-172
179.29
I-73.svg I-73 Candor, North Carolina (US-220) to Greensboro, North Carolina (I-40 & I-85)
North Carolina Intrastate Interstate
Associated routes: none
12.27
I-74.svg I-74 West Bettendorf, Iowa (I-80) to Cincinnati, Ohio (I-75)
7 States Served: IA, IL, IN, OH, WV, VA, NC
Associated route: I-474
416.71
I-74.svg I-74 East Cana, Virginia (I-77) to Mount Airy, North Carolina (US-52)
2 States Served: VA, NC. Planned: WV
Associated routes: none
12.10
I-75.svg I-75 Hialeah, Florida (FL-826) to Sault Ste. Marie, Michigan (Canada)
6 States Served: FL, GA, TN, KY, OH, MI
Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
1,786.47
I-76.svg I-76 West Denver, Colorado (I-70) to Big Springs, Nebraska (I-80)
2 States Served: Colorado, Nebraska
Associated routes: none
187.34
I-76.svg I-76 East Westfield Center, Ohio (I-71) to Camden, New Jersey (I-295)
3 States Served: Ohio, Pennsylvania, New Jersey
Associated routes: I-176, I-276, I-376, I-476, I-676
434.36
I-77.svg I-77 Columbia, South Carolina (I-26) to Cleveland, Ohio (I-90)
5 States Served: South Carolina, North Carolina, Virginia, West Virginia, Ohio
Associated routes: I-277
610.10
I-78.svg I-78 Union Twp., Pennsylvania (I-81) to New York, New York
3 States Served: Pennsylvania, New Jersey, New York
Associated routes: I-278, I-478*, I-678, I-878*
143.56
I-79.svg I-79 Charleston, West Virginia (I-77) to Erie, Pennsylvania (PA-5)
2 States Served: West Virginia, Pennsylvania
Associated routes: I-279, I-579
343.24
I-80.svg 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, NJ
Associated routes: I-180, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980
2,899.54
I-81.svg I-81 Dandridge, Tennessee (I-40) to Fisher's Landing, New York (Canada)
6 States Served: TN, VA, WV, MD, PA, NY
Associated routes: I-181, I-381, I-481, I-581
854.89
I-82.svg I-82 Ellensburg, Washington (I-90) to Hermiston, Oregon (I-84)
2 States Served: Washington, Oregon
Associated route: I-182
143.58
I-83.svg I-83 Baltimore, Maryland to Harrisburg, Pennsylvania (I-81)
2 States Served: Maryland, Pennsylvania
Associated route: I-283
85.3
I-84.svg I-84 West Portland, Oregon (I-5) to Echo, Utah (I-80)
3 States Served: Oregon, Idaho, Utah
Associated route: I-184
769.62
I-84.svg I-84 East Scranton, Pennsylvania (I-81) to Sturbridge, Massachusetts (I-90)
4 States Served: Pennsylvania, New York, Connecticut, Massachusetts
Associated routes: I-384, I-684
232.4
I-85.svg I-85 Montgomery, Alabama (I-65) to Petersburg, Virginia (I-95)
5 States Served: Alabama, Georgia, South Carolina, North Carolina, Virginia
Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-985
668.75
I-86.svg I-86 West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15)
Idaho Intrastate Interstate
Associated routes: none
62.85
I-86.svg I-86 East Erie, Pennsylvania (I-90) to Elmira, New York (NY-17)
2 States Served: Pennsylvania, New York
Associated routes: none
183.56
I-87.svg I-87 New York, New York (I-278) to Champlain, New York (Canada)
New York Intrastate Interstate
Associated routes: I-287, I-587, I-787
333.49
I-88.svg I-88 West Barstow, Illinois (I-80) to Chicago, Illinois (I-290)
Illinois Intrastate Interstate
Associated routes: none
140.6
I-88.svg I-88 East Binghamton, New York (I-81) to Schenectady, New York (I-90)
New York Intrastate Interstate
Associated routes: none
117.75
I-89.svg I-89 Bow, New Hampshire (I-93) to Highgate Springs, Vermont (Canada)
2 States Served: New Hampshire, Vermont
Associated route: I-189
191.12
I-90.svg 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, MA
Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990
3,020.54
I-91.svg I-91 New Haven, Connecticut/North Haven, Connecticut (I-95) to Derby Line, Vermont (Canada)
3 States Served: Connecticut, Massachusetts, Vermont
Associated routes: I-291, I-391, I-691
290.37
I-93.svg I-93 Canton, Massachusetts (I-95) to St. Johnsbury, Vermont (I-91)
3 States Served: Massachusetts, New Hampshire, Vermont
Associated routes: I-293, I-393
189.95
I-94.svg I-94 Billings, Montana (I-90) to Port Huron, Michigan (Canada)
7 States Served: MT, ND, MN, WI, IL, IN, MI
Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894
1,585.20
I-95.svg 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, ME
Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895
1,925.74
I-96.svg I-96 Muskegon, Michigan (US-31) to Detroit, Michigan (I-75)
Michigan Intrastate Interstate
Associated routes: I-196, I-296*, I-496, I-696
192.06
I-97.svg I-97 Annapolis, Maryland (US-50) to Baltimore, Maryland (I-695)
Maryland Intrastate Interstate
Associated routes: none
17.62
I-99.svg I-99 Bedford, Pennsylvania (I-76) to Bellefonte, Pennsylvania (I-80)
Pennsylvania Intrastate Interstate
Associated routes: none
85.0

Interstates outside of the mainland[change | change source]

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[change | change source]

The Interstate Highways in the island of Oʻahu, 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.

Interstate Route Length (miles)[1]
I-H1.svg H-1
 
Kapolei, Hawaii (HI-93) to Honolulu, Hawaii (HI-72)
Associated route: H-201
27.16
I-H2.svg H-2
 
Pearl City, Hawaii (H-1) to Wahiawa, Hawaii (HI-99)
 
8.33
I-H3.svg H-3
 
Halawa, Hawaii (H-1 & H-201) to Marine Corps Base Hawaii
 
15.32

Alaska and Puerto Rico[change | change source]

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.

Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway.[3]

Alaska[change | change source]

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.[4]

Puerto Rico[change | change source]

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.[5]

Related pages[change | change source]

References[change | change source]

Other websites[change | change source]