This is a list of 3-digit Interstate highway route designations in the United States. They are sorted in the order of the Primary Interstate, the state the 3-digit Interstate is in, and then in the order of multiple branches of the 3-digit Interstates.
Interstate 5
3-digit interstates associated with I-5:
- I-205 (near Tracy)
- I-305 (Sacramento)
- I-405 (metro Los Angeles)
- I-105 (metro Los Angeles)
- I-505 (Vacaville)
- I-605 (metro Los Angeles)
- I-805 (metro San Diego)
Interstate 10
3-digit interstates associated with I-10:
- I-110 (metro Los Angeles)
- I-210 (metro Los Angeles)
- I-710 (metro Los Angeles)
- I-110 (Pensacola)
- I-110 (Baton Rouge)
- I-210 (Lake Charles)
- I-310 (New Orleans)
- I-510 (New Orleans)
- I-610 (New Orleans)
- I-910 (New Orleans)
- I-110 (El Paso)
- I-410 (San Antonio)
- I-610 (Houston)
Interstate 15
3-digit interstates associated with I-15:
- I-215 (metro San Bernardino-Riverside/Riverside County)
- I-115 (Butte)
- I-315 (Great Falls)
- I-215 (metro Salt Lake City)
Interstate 16
3-digit interstates associated with I-16:
- I-516 (Savannah)
Interstate 20
3-digit interstates associated with I-20:
- I-520 (Augusta)
- I-220 (metro Shreveport)
- I-820 (Jackson)
- I-820 (Ft. Worth)
Interstate 25
3-digit interstates associated with I-25:
- I-225 (metro Denver)
Interstate 29
3-digit interstates associated with I-29:
- I-129 (Sioux City)
- I-229 (metro St. Joseph)
- I-129 (South Sioux City)
- I-229 (metro Sioux Falls)
Interstate 35
3-digit interstates associated with I-35:
- I-235 (Des Moines)
- I-135 (from Wichita to Salina)
- I-235 (Wichita)
- I-335 (from Topeka to Emporia)
- I-435 (metro Kansas City)
- I-635 (metro Kansas City)
- I-535 (Duluth)
- I-435 (metro Kansas City)
- I-635 (metro Kansas City)
- I-235 (Oklahoma City)
- I-635 (metro Dallas)
- I-535 (Superior)
Interstate 44
3-digit interstates associated with I-44:
Interstate 45
3-digit interstates associated with I-45:
- I-345 (Dallas)
Interstate 55
3-digit interstates associated with I-55:
- I-155 (from Lincoln to Peoria)
- I-255 (East St. Louis)
- I-355 (metro Chicago)
- I-155 (Caruthersville)
- I-255 (metro St. Louis)
- I-155 (Dyersburg)
Interstate 70
3-digit interstates associated with I-70:
- I-270 (metro Denver)
- I-270 (metro East St. Louis)
- I-470 (metro Kansas City)
- I-670 (metro Kansas City)
- I-270 (Rockville/Gaithersburg)
- I-370 (metro Washington, D.C.)
- I-170 (metro St. Louis)
- I-270 (metro St. Louis)
- I-470 (metro Kansas City)
- I-670 (metro Kansas City)
- I-470 (near Wheeling)
Interstate 75
3-digit interstates associated with I-75:
- I-475 (Macon)
- I-575 (from Marietta to Canton/Cherokee County)
- I-675 (Atlanta)
- I-275
- I-275 (Cincinnati)
- I-475 (Toledo)
- I-675 (Dayton)
- I-275 (Knoxville)
Interstate 80
3-digit interstates associated with I-80:
- I-280 (San Francisco Bay Area)
- I-680 (metro San Jose)
- I-380 (San Francisco Bay Area)
- I-580 (from Oakland to Tracy)
- I-780 (Vallejo)
- I-880 (from San Jose to Oakland)
- I-980 (Oakland)
- I-180
- I-280 (Rock Island)
- I-280 (Davenport)
- I-380 (Waterloo, Cedar Rapids, Iowa City)
- I-480 (Council Bluffs)
- I-680 (near Omaha, Nebraska)
- I-580 (Reno)
- I-280 (metro Newark)
- I-280 (Toledo)
- I-480 (Cleveland)
- I-680 (Youngstown)
- I-180 (Williamsport)
- I-380 (Scranton)
- I-180 (Cheyenne)
Interstate 82
3-digit interstates associated with I-82:
- I-182 (metro Tri-Cities)
Interstate 84
3-digit interstates associated with I-84:
- I-184 (metro Hartford)
- I-684
- I-184 (Boise)
- I-684 (White Plains)
Interstate 96
3-digit interstates associated with I-96:
- I-196 (from Grand Rapids to Benton Harbor)
- I-496 (Lansing)
- I-696 (metro Detroit)
Miscellaneous
A list of 3di superlatives:
- Only 2 3di's that run concurrent: I-271 and I-480 (metro Cleveland, Ohio)
- Only 3di in Hawaii: I-H201 (Honolulu)
- Only orphan: I-238 (California)
- Shortest signed interstate: I-375 (Michigan)
This list is incomplete; you can help by adding missing items. |