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Interstate Highways in the 48 contiguous states. Purple routes are currently built and open freeways, blue are currently open spur routes, and green indicates proposed routes, future roads, or those currently under construction.

Primary Interstate Highways are the major interstate highways of the United States and are assigned a one or two-digit route number. Even route numbers are assigned to east/west routes, with the lower numbered routes being further south (I-10) and higher numbered routes in the north (I-90). Similarly, odd route numbers are assigned to north/south routes, with the lower numbered routes being further west (I-5) and the higher numbered routes being further east (I-95).

There are five pairs of numbers that are duplicated throughout the system; the corresponding highways are separated by large distances to prevent confusion. Below, these are differentiated from each other by West and East.

Three-digit Interstates are spur or loop Interstates that usually service large cities and suburbs. The last two digits of a three-digit Interstate are always the number of the parent route, the primary Interstate where it originated. If the first digit is odd, the Interstate is typically a spur route while if the first digit is even, the Interstate is typically a loop route. Three-digit Interstates are covered in their parent route's article, and those that have their own articles are linked below.

Contents

Primary Interstates

There are 66 primary Interstates listed in the table below, with 43 of them having auxiliary routes. Listed lengths are as of October 31, 2002.

Routes ending in 0 or 5 are highlighted in green.

Interstate
Route
Associated routes (* not signposted as interstates)
Length[1]
(miles)
 I-4.svg I-4 Tampa, Florida (I-275) to Daytona Beach, Florida (I-95)
Associated routes: none
132.30
 I-5.svg I-5 San Ysidro, California (Mexico) to Blaine, Washington (Canada)
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 to Casa Grande, Arizona (I-10)
Associated routes: none
348.25
I-10.svg I-10 Santa Monica, California (CA-1) to Jacksonville, Florida (I-95)
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)
Associated routes: none
85.59
I-15.svg I-15 San Diego, California (CA-15) to Sweetgrass, Montana (Canada)
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
Associated route: I-516
166.81
I-17.svg I-17 Phoenix, Arizona (I-10) to Flagstaff, Arizona (I-40)
Associated routes: none
145.76
I-19.svg I-19 Nogales, Arizona (Mexico) to Tucson, Arizona (I-10)
Associated routes: none
63.35
I-20.svg I-20 Kent, Texas (I-10) to Florence, South Carolina (I-95)
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-20, I-59 & I-65)
Under construction
213.0
I-24.svg I-24 Pulley's Mill, Illinois (I-57) to Chattanooga, Tennessee (I-75)
Associated route: I-124
316.36
I-25.svg I-25 Las Cruces, New Mexico (I-10) to Buffalo, Wyoming (I-90)
Associated route: I-225
1,062.77
I-26.svg I-26 Colonial Heights, Tennessee (I-81) to Charleston, South Carolina (US-17)
Associated routes: I-126, I-526
260.87
I-27.svg I-27 Lubbock, Texas (US-87) to Amarillo, Texas (I-40)
Associated routes: none
124.13
I-29.svg I-29 Kansas City, Missouri (I-35 & I-70) to Pembina, North Dakota (Canada)
Associated routes: I-129, I-229
755.51
I-30.svg I-30 Fort Worth, Texas (I-20) to Little Rock, Arkansas (I-40)
Associated routes: I-430, I-530, I-630
366.76
I-35.svg I-35 Laredo, Texas (Mexico) to Duluth, Minnesota (MN-61)
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)
Associated routes: none
143.00
I-39.svg I-39 Normal, Illinois (I-55) to Wausau, Wisconsin (WIS 29)
Associated routes: none
306.14
I-40.svg I-40 Barstow, California (I-15) to Wilmington, North Carolina (NC-132)
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 Green Bay, Wisconsin (US-41)
Associated routes: none
191.55
I-44.svg I-44 Wichita Falls, Texas (US-287) to St. Louis, Missouri (I-55)
Associated routes: I-244, I-444*
633.79
I-45.svg I-45 Galveston, Texas (TX-87) to Dallas, Texas (I-30)
Associated route: I-345*
284.91
I-49.svg I-49 Lafayette, Louisiana (I-10) to Shreveport, Louisiana (I-20)
Associated routes: none
208.25
I-55.svg I-55 Laplace, Louisiana (I-10) to Chicago, Illinois (US-41, Lake Shore Drive)
Associated routes: I-155, I-255, I-355
964.25
I-57.svg I-57 Miner, Missouri (I-55) to Chicago, Illinois (I-94)
Associated routes: none
386.12
I-59.svg I-59 Slidell, Louisiana (I-10 & I-12) to Lookout Mountain, Georgia (I-24)
Associated routes: I-359, I-459, I-759
445.23
I-64.svg I-64 Weldon Spring, Missouri (I-70) to Chesapeake, Virginia (I-264 & I-664)
Associated routes: I-164, I-264, I-464, I-564, I-664
937.71
I-65.svg I-65 Mobile, Alabama (I-10) to Gary, Indiana (I-90)
Associated routes: I-165, I-465, I-565, I-865
887.30
I-66.svg I-66 Middletown, Virginia (I-81) to Washington, D.C. (US-29)
Associated routes: none
76.28
I-68.svg I-68 Morgantown, West Virginia (I-79) to Hancock, Maryland (I-70)
Associated routes: none
113.15
I-69.svg I-69 Indianapolis, Indiana (I-465) to Port Huron, Michigan (Canada)
Associated route: I-469
355.81
I-70.svg I-70 Cove Fort, Utah (I-15) to Baltimore, Maryland (I-695)
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)
Associated routes: I-271, I-471
345.57
I-72.svg I-72 Hannibal, Missouri (US-61) to Champaign, Illinois (I-57)
Associated route: I-172
179.29
I-73.svg I-73 Candor, North Carolina (US-220) to Greensboro, North Carolina (I-40 & I-85)
Associated routes: none
12.27
I-74.svg I-74 West Bettendorf, Iowa (I-80) to Cincinnati, Ohio (I-75)
Associated route: I-474
416.71
I-74.svg I-74 East Cana, Virginia (I-77) to Mount Airy, North Carolina (US-52)
Associated routes: none
12.10
I-75.svg I-75 Hialeah, Florida (FL-826) to Sault Ste. Marie, Michigan (Canada)
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)
Associated routes: none
187.34
I-76.svg I-76 East Westfield Center, Ohio (I-71) to Camden, New Jersey (I-295)
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)
Associated routes: I-277
610.10
I-78.svg I-78 Union Twp., Pennsylvania (I-81) to New York, 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)
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)
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)
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)
Associated route: I-182
143.58
I-83.svg I-83 Baltimore, Maryland to Harrisburg, Pennsylvania (I-81)
Associated route: I-283
85.3
I-84.svg I-84 West Portland, Oregon (I-5) to Echo, Utah (I-80)
Associated route: I-184
769.62
I-84.svg I-84 East Scranton, Pennsylvania (I-81) to Sturbridge, Massachusetts (I-90)
Associated routes: I-384, I-684
232.4
I-85.svg I-85 Montgomery, Alabama (I-65) to Petersburg, Virginia (I-95)
Associated routes: I-185, I-285, I-385, I-485, I-585, I-985
668.75
I-86.svg I-86 West Heyburn, Idaho (I-84) to Pocatello, Idaho (I-15)
Associated routes: none
62.85
I-86.svg I-86 East Erie, Pennsylvania (I-90) to Elmira, New York (NY-17)
Associated routes: none
183.56
I-87.svg I-87 New York, New York (I-278) to Champlain, New York (Canada)
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)
Associated routes: none
140.6
I-88.svg I-88 East Binghamton, New York (I-81) to Schenectady, New York (I-90)
Associated routes: none
117.75
I-89.svg I-89 Concord, New Hampshire (I-93) to Highgate Springs, Vermont (Canada)
Associated route: I-189
191.12
I-90.svg I-90 Seattle, Washington (WA-519) to Boston, Massachusetts (MA-1A)
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 (I-95) to Derby Line, Vermont (Canada)
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)
Associated routes: I-293, I-393
189.95
I-94.svg I-94 Billings, Montana (I-90) to Port Huron, Michigan (Canada)
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)
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)
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)
Associated routes: none
17.62
I-99.svg I-99 Bedford, Pennsylvania (I-76) to Bellefonte, Pennsylvania (I-80)
Associated routes: none
85.0

Interstates outside of the mainland

Interstate Highways not only reside in the contiguous 48 states of the United States, but there are also Interstates in Hawaii, Alaska, and Puerto Rico.

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Hawaiian Interstates

The Interstate Highways in the island of Oʻahu, Hawaii are signed with the standard Interstate shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate routes. H-4 and H-5 are proposed, but construction was often blocked by local activists, such as environmentalists seeking to preserve the rainforests, and Native Hawaiians oppose the routes being laid out on sacred tribal sites.

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

Alaska and Puerto Rico

The Federal Highway Administration funds 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 are not required to meet the same standards as the mainland routes:

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.[2]

Alaska

Map of the Interstates in Alaska

Alaska's "Interstates" are unsigned, though they all have state highway numbers (which do not match the Interstate numbers).[3]

Puerto Rico

Map of the Interstates in Puerto Rico

Like Alaska, Puerto Rico signs its "Interstates" as territorial routes, and the numbers do not match their official Interstate designations. PR-4 is proposed in the southeast side of the island. However, many of the territory's routes are freeway-standard toll roads.[4]

See also

References

  1. ^ a b Federal Highway Administration Route Log and Finder List - Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002
  2. ^ Federal Highway Administration. "FHWA Route Log and Finder List". http://www.fhwa.dot.gov/reports/routefinder/index.htm. Retrieved 2007-05-24.  ]
  3. ^ Voss, Oscar. "Alaska Roads - Interstate ends photos". http://www.alaskaroads.com/Interstate-ends.htm. Retrieved 2007-05-24.  
  4. ^ Voss, Oscar. "Puerto Rico road photos". http://www.hawaiihighways.com/Puerto-Rico-page2.html. Retrieved 2007-05-24.  

External links

Main Interstate Highways (major interstates highlighted)
4 5 8 10 12 15 16 17 19 20 22 24 25 26 27 29 30
35 37 39 40 43 44 45 49 55 57 59 64 65 66 68 69
70 71 72 73 74 75 76 (W) 76 (E) 77 78 79 80 81 82
83 84 (W) 84 (E) 85 86 (W) 86 (E) 87 88 (W) 88 (E) 89 90
91 93 94 95 96 97 99 (238) H-1 H-2 H-3
Unsigned  A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists  Primary  Main - Intrastate - Suffixed - Future - Gaps
Auxiliary  Main - Future - Unsigned
Other  Standards - Business - Bypassed

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