Alaskan Interstates
A1--Anchorage to Canadian border (signed as AK 1 from Anchorage to Tok Junction; AK 2 from Tok Junction to Canadian border)
A2--Tok Junction to Fairbanks (signed as AK 2 from Tok Junction to Fairbanks)
A3--Soldotna to Anchorage (signed as AK 1 from Soldotna to Anchorage)
A4--Palmer to Fairbanks (signed as AK 3 from Palmer to Anchorage)
Puerto Rican Interstates
PR1--Ponce to San Juan (signed as PR 52 from Ponce to PR 18; PR 18 from PR 52 to San Juan)
PR2--Ponce to San Juan (signed as PR 2 from Ponce to Hatillo; PR 22 from Hatillo to San Juan)
PR3--Ceiba to San Juan (signed as PR 26 through San Juan; PR 3 from San Juan to Fajardo; PR 53 from Fajardo to Ceiba)
Interstate 110--El Paso, TX
Interstate 910--Marrero to New Orleans, LA
Interstate 315--Great Falls, MT
Interstate 124--Chattanooga, TN
Interstate 444--Tulsa, OK
Interstate 345--Dallas, TX
Interstate 478--Brooklyn-Battery Tunnel, New York City
Interstate 878--Queens, NY
Interstate 580--Carson City to Reno, NV
Interstate 495--Portland to Falmouth, ME
Interstate 595--Washington, DC to Annapolis, MD
Interstate 695--Washington, DC
Interstate 296--Grand Rapids, MI
Interstate 210--Mobile, AL (now I-165)
Interstate 305--Salem, OR
Interstate 505--Portland, OR (now US 30)
Interstate 15E--Murrietta to Devore, CA (now I-215)
Interstate 15W--Heyburn to Pocatello, ID (now the western I-86)
Interstate 415--Salt Lake City, UT (now part of I-215)
Interstate 420--Atlanta, GA (now GA 154/GA 166)
Interstate 420--Monroe, LA
Interstate 326--Columbia, SC (now I-77)
Interstate 35W--Wichita to Salina, KS (now I-135)
Interstate 335--Minneapolis, MN
Interstate 440--Oklahoma City, OK (now I-240)
Interstate 244--Mehlville to Bridgeton, MO (now I-255/I-270, a full beltway around St. Louis)
Interstate 255--Memphis, TN (now I-240)
Interstate 455--Bolingbrook to Itasca, IL (now I-355)
Interstate 755--St. Louis, MO
Interstate 265--Nashville, TN (now I-65)
Interstate 70N--Frederick to Baltimore, MD (now I-70)
Interstate 70S--Frederick to Bethesda, MD (now I-270)
Interstate 70S--Washington to New Stanton, PA (now I-70)
Interstate 170--Baltimore, MD (now US 40)
Interstate 470--Denver, CO (now CO 470, E470 and W470)
Interstate 172--Quincy to Springfield, IL (now I-72)
Interstate 174--Moline, IL to Bettendorf, IA (now I-74)
Interstate 274--Coloma, IL to Davenport, IA (now I-280)
Interstate 75E--Ellenton to Lutz, FL (now I-75)
Interstate 175--Albany to Cordele, GA (now GA 300)
Interstate 378--Bethlehem, PA (now PA 378)
Interstate 80N--Portland, OR to Echo Junction, UT (now the western I-84)
Interstate 80N--Loveland to Minden, IA (now I-680)
Interstate 80N--Norwalk to Youngstown, OH (now I-480 and I-680)
Interstate 80S--Denver, CO to Big Springs, NE (now the western I-76)
Interstate 80S--Norwalk, OH to Camden, NJ (now the eastern I-76)
Interstate 180N--Boise, ID (now I-184)
Interstate 180--San Rafael to Richmond, CA (now I-580)
Interstate 280--Omaha, NE to Council Bluffs, IA (now I-680)
Interstate 480--San Francisco, CA (the freeway itself has been demolished)
Interstate 580--Omaha, NE (now US 75)
Interstate 880--Sacramento, CA (now I-80)
Interstate 81E--Pocono Summit to Scranton, PA (now I-380)
Interstate 181--Tri-Cities, TN (now I-26)
Interstate 281--Syracuse, NY (now I-481)
Interstate 284--East Hartford to South Windsor, CT
Interstate 484--Hartford, CT
Interstate 485--Atlanta, GA (now GA 10)
Interstate 86--Wethersfield, CT to Sturbridge, MA (now the eastern I-84)
Interstate 687--Albany, NY
Interstate 90N--Buffalo to Niagara Falls, NY
Interstate 290--Cleveland, OH (now I-490)
Interstate 193--Bedford to Manchester, NH (now I-293)
Interstate 494--Chicago, IL
Interstate 694--Chicago, IL (now US 41)
Interstate 495--Secaucus, NJ to Manhattan, NY (now NJ 495)
Interstate 595--Baltimore, MD (would've incorporated parts of I-70 and I-170)
Interstate 695--Boston, MA
Interstate 695--South of Newark, NJ (connector from unbuilt I-95 to I-287)
Interstate 695--Philadelphia, PA
Interstate 895--Northeast Philadelphia, PA to Burlington, NJ
Interstate 895--Richmond, RI to Attleboro, MA
Interstate 9 is planned to run from Mettler to Stockton, CA. Originally, the CA 99 freeway from Mettler to Sacramento was planned to be upgraded to Interstate 7. Nevertheless, Bakersfield and Fresno would be connected to the Interstate system.
Interstate 14 is planned to run from Alexandria, LA to North Augusta, SC. It might be extended to Myrtle Beach, SC and also to Austin, TX.
Interstate 41 is planned to follow the US 41 corridor from Milwaukee to Green Bay, WI. It is unknown what US 41's fate will be if I-41 is ever signed.
Some other planned routes include:
Interstate 605--Seattle, WA
Interstate 905--San Diego, CA
Interstate 310--Biloxi, MS
Interstate 410--Baton Rouge, LA
Interstate 130--Texarkana, AR (may become part of an extended I-49)
Interstate 730--Swifton to Jonesboro, AR
Interstate 140--Wilmington, NC
Interstate 840--Northern loop of a new beltway around Greensboro, NC
Interstate 840--Outer loop around Nashville, TN
Interstate 555--Turrell to Jonesboro, AR
Interstate 364--St. Louis, MO
Interstate 169--Union City to Martin, TN
Interstate 269--Outer loop around Memphis, TN
Interstate 370--St. Louis, MO
Interstate 570--Kingdom City to Columbia, MO (via Jefferson City)
Interstate 174--Myrtle Beach, SC
Interstate 274--Winston-Salem, NC
Interstate 475--Tampa Bay, FL
Interstate 475--Outer loop around Knoxville, TN
Interstate 576--Pittsburgh, PA
Interstate 285--Lexington to Winston-Salem, NC
Interstate 785--Greensboro, NC to Danville, VA
Interstate 289--Burlington, VT
Interstate 295--Fayetteville, NC
Interstate 495--Raleigh to Rocky Mount, NC
Interstate 795--Goldsboro to Wilson, NC
Interstate 795--Jacksonville, FL
Interstate 895--Richmond, VA
Interstate 31--Wichita, KS to Lincoln, NE
Interstate 32--Raton, NM to Fort Worth, TX
Interstate 61--Gulfport to Jackson, MS
Interstate 63--Mobile to Muscle Shoals, AL
Interstate 67, Proposal 1--Cottondale, FL to Montgomery, AL
Interstate 67, Proposal 2--Indianapolis, IN to Ludington, MI
Interstate 67, Proposal 3--Bristol, IN to Petoskey, MI
Interstate 67, Proposal 4--Grantsville, MD to Buffalo, NY
Interstate 92--Glens Falls, NY to Portsmouth, NH
Interstate 98, Proposal 1--Watertown to Champlain, NY
Interstate 98, Proposal 2--Gilead to Calais, ME
Interstate 101--Raleigh, NC to Wilmington, DE
Two-Digit Interstates
Three-Digit Interstates
Fictional Interstates
Links to Other Highway Sites