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List of Interstate Highways
Primary interstates 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).
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. (In the table below, interstates designated with an asterisk are "secret" interstates — that is, they are not signposted as interstates.)
Primary Interstates
Interstate 4
| – Tampa, FL (I-275) to Daytona Beach, FL (I-95)
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Interstate 5
| – San Ysidro, CA (Mexican border) to Blaine, WA (Canadian border)
Associated routes: I-105 | I-205 | I-305* | I-405 | I-505 | I-605 | I-705 | I-805 |
Interstate 8
| – San Diego, CA to Casa Grande, AZ (I-10)
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Interstate 10
| – Santa Monica, CA to Jacksonville, FL (I-95)
Associated routes: I-110 | I-210 | I-310 | I-410 | I-510 | I-610 | I-710 | I-910 |
Interstate 12
| – Baton Rouge, LA (I-10) to Alton, LA (I-10)
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Interstate 15
| – San Diego, CA (CA-15) to Sweetgrass, MT (Canadian border)
Associated routes: I-115 | I-215 | I-315* | I-515 |
Interstate 16
| – Macon, GA (I-75) to Savannah, GA
Associated route: I-516 |
Interstate 17
| – Phoenix, AZ (I-10) to Flagstaff, AZ (I-40)
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Interstate 19
| – Nogales, AZ (Mexican border) to Tucson, AZ (I-10)
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Interstate 20
| – Kent, TX (I-10) to Florence, SC (I-95)
Associated routes: I-220 | I-520 | I-820 |
Interstate 22
| – Memphis, TN (I-55 & I-40) to Birmingham, AL (I-20, I-59 & I-65)
Under construction – opening 2006 |
Interstate 24
| – Pulley's Mill, IL (I-57) to Chattanooga, TN (I-75)
Associated route: I-124 |
Interstate 25
| – Las Cruces, NM (I-10) to Buffalo, WY (I-90)
Associated route: I-225 |
Interstate 26
| – Colonial Heights, TN (I-81) to Charleston, SC (US-17)
Associated routes: I-126 | I-526 |
Interstate 27
| – Lubbock, TX to Amarillo, TX (I-40)
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Interstate 29
| – Kansas City, MO (I-35 & I-70) to Pembina, ND (Canadian border)
Associated routes: I-129 | I-229 |
Interstate 30
| – Fort Worth, TX (I-20) to Little Rock, AR (I-40)
Associated routes: I-430 | I-530 | I-630 |
Interstate 35
| – Laredo, TX (Mexican border) to Duluth, MN (MN-61)
Associated routes: I-35E | I-35W | I-135 | I-235 | I-335 | I-435 | I-535 | I-635 |
Interstate 37
| – Corpus Christi, TX (US-181) to San Antonio, TX (I-35)
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Interstate 39
| – Normal, IL (I-55) to Wausau, WI
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Interstate 40
| – Barstow, CA (I-15) to Wilmington, NC (NC-132)
Associated routes: I-140 | I-240 | I-440 | I-540 | I-840 |
Interstate 43
| – Beloit, WI (I-39, I-90 and I-94) to Green Bay, WI (US-41)
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Interstate 44
| – Wichita Falls, TX (US-287) to St. Louis, MO (I-55)
Associated routes: I-244 | I-444* |
Interstate 45
| – Galveston, TX (TX-124) to Dallas, TX (I-30)
Associated route: I-345* |
Interstate 49
| – Lafayette, LA (I-10) to Shreveport, LA (I-20)
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Interstate 55
| – La Place, LA (I-10) to Chicago, IL (US-41)
Associated routes: I-155 | I-255 |
Interstate 57
| – Miner, MO (I-55) to Chicago, IL (I-94)
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Interstate 59
| – Alton, LA (I-10 & I-12) to Lookout Mountain, GA (I-24)
Associated routes: I-359 | I-459 | I-759 |
Interstate 64
| – St. Louis, MO (I-270) to Chesapeake, VA (I-264 & I-664)
Associated routes: I-164 | I-264 | I-464 | I-564 | I-664 |
Interstate 65
| – Mobile, AL (I-10) to Gary, IN (I-90)
Associated routes: I-165 | I-465 | I-565 | I-865 |
Interstate 66
| – Middletown, VA (I-81) to Washington, D.C. (US-29)
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Interstate 68
| – Morgantown, WV (I-79) to Hancock, MD (I-70)
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Interstate 69
| – Indianapolis, IN (I-465) to Port Huron, MI (Canadian border)
Associated route: I-469 |
Interstate 70
| – Cove Fort, UT (I-15) to Baltimore, MD (I-695)
Associated routes: I-170 | I-270 | I-370 | I-470 | I-670 |
Interstate 71
| – Louisville, KY (I-64) to Cleveland, OH (I-90)
Associated routes: I-271 | I-471 |
Interstate 72
| – Hannibal, MO (US-61) to Champaign, IL (I-57)
Associated route: I-172 |
Interstate 73
| – Candor, NC (US-220) to Greensboro, NC (I-40 & I-85)
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Interstate 74
| – Bettendorf, IA (I-80) to Cincinnati, OH (I-75)
Associated route: I-474 |
Interstate 75
| – Ft. Lauderdale, FL (FL-826) to Sault Ste. Marie, MI (Canadian border)
Associated routes: I-175 | I-275 | I-375 | I-475 | I-575 | I-675 |
Interstate 76
| – West – Denver, CO (I-70) to Big Spring, NE (I-80)
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Interstate 76
| – East – Westfield Center, OH (I-71) to Camden, NJ (I-295)
Associated routes: I-176 | I-276 | I-376 | I-476 | I-676 |
Interstate 77
| – Columbia, SC (I-26) to Cleveland, OH (I-90)
Associated route: I-277 |
Interstate 78
| – Bordnersville, PA (I-81) to New York City, NY
Associated routes: I-278 | I-478* | I-678 | I-878* |
Interstate 79
| – Charleston, WV (I-77) to Erie, PA (PA-5)
Associated routes: I-279 | I-579 |
Interstate 80
| – San Francisco, CA (US-101) to Fort Lee, NJ (I-95)
Associated routes: I-180 | I-280 | I-380 | I-480 | I-580 | I-680 | I-780 | I-880 | I-980 |
Interstate 81
| – Dandridge, TN (I-40) to Fisher's Landing, NY (Canadian border)
Associated routes: I-181 | I-381 | I-481 | I-581 |
Interstate 82
| – Ellensburg, WA (I-90) to Hermiston, OR (I-84)
Associated route: I-182 |
Interstate 83
| – Baltimore, MD to Harrisburg, PA (I-81)
Associated route: I-283 |
Interstate 84
| – West – Portland, OR (I-5) to Echo, UT (I-80)
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Interstate 84
| – East – Scranton, PA (I-81) to Sturbridge, MA (I-90)
Associated routes: I-384 | I-684 |
Interstate 85
| – Montgomery, AL (I-65) to Petersburg, VA (I-95)
Associated routes: I-185 | I-285 | I-385 | I-485 | I-585 | I-985 |
Interstate 86
| – West – Heyburn, ID (I-84) to Pocatello, ID (I-15)
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Interstate 86
| – East – Erie, PA (I-90) to Elmira, NY (NY-17)
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Interstate 87
| – New York, NY (I-278) to Champlain, NY (Canadian border)
Associated routes: I-287 | I-587 | I-787 |
Interstate 88
| – West – Moline, IL (I-80) to Chicago, IL (I-290)
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Interstate 88
| – East – Binghamton, NY (I-81) to Schenectady, NY (I-90)
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Interstate 89
| – Concord, NH (I-93) to Highgate Springs, VT (Canadian border)
Associated route: I-189 |
Interstate 90
| – Seattle, WA to Boston, MA
Associated routes: I-190 | I-290 | I-390 | I-490 | I-590 | I-690 | I-790 | I-890 | I-990 |
Interstate 91
| – New Haven, CT (I-95) to Derby Line, VT (Canadian border)
Associated routes: I-291 | I-391 | I-691 |
Interstate 93
| – Canton, MA (I-95) to St. Johnsbury, VT (I-91)
Associated routes: I-293 | I-393 |
Interstate 94
| – Billings, MT (I-90) to Port Huron, MI (Canadian border)
Associated routes: I-194 | I-294 | I-394 | I-494 | I-694 | I-794 | I-894 |
Interstate 95
| – Miami, FL (US-1) to Houlton, ME (Canadian border)
Associated routes: I-195 | I-295 | I-395 | I-495 | I-595 | I-695 | I-795 | I-895 |
Interstate 96
| – Muskegon, MI (US-31) to Detroit, MI (I-75)
Associated routes: I-196 | I-296* | I-496 | I-696 |
Interstate 97
| – Annapolis, MD (US-50) to Baltimore, MD (I-695)
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Interstate 99
| – Bedford, PA (I-76) to Bald Eagle, PA (US-220)
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Interstate 238
| – Hayward, CA (I-580) to San Lorenzo, CA (I-880)
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Hawaiian Interstates
The interstate highways in 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.
- Associated route: I-H-201
Alaskan and Puerto Rican Interstates
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." [1]
Alaska's "Interstates" are unsigned, though they all have state highway numbers (which don't match the Interstate numbers).[2]
Like Alaska, Puerto Rico signs its "Interstates" as territorial routes, and the numbers do not match their official Interstate designations. However, many of the territory's routes are freeway-standard toll roads.[3]
External links
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