| dbp:notes
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- dbr:Alaska_Highway
- dbr:Alaska_Route_1
- dbr:George_Parks_Highway
- dbr:Glenn_Highway
- dbr:Richardson_Highway
- dbr:Seward_Highway
- dbr:Sterling_Highway
- none (en)
- Serves four states: Pennsylvania, New York, Connecticut, Massachusetts (en)
- Associated route: I-189 (en)
- Associated route: I-283 (en)
- Associated routes: I-278, I-478, I-678, I-878 (en)
- Associated routes: I-279, I-579 (en)
- Associated routes: I-287, I-587, I-787 (en)
- Associated routes: I-293, I-393 (en)
- Associated routes: I-384, I-684 (en)
- Longest primary north-south Interstate highway (en)
- New York only (en)
- Associated routes: I-176, I-276, I-376, I-476, I-676 (en)
- Unfinished in Texas, Mississippi, Kentucky, and Indiana; serves six states: Texas, Mississippi, Kentucky, Indiana, Michigan. Planned/started in 3 more: Louisiana, Arkansas, Tennessee (en)
- Associated routes: I-180, I-238, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980 (en)
- Planned associated routes: I-222 and I-422 in Alabama (en)
- Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled (en)
- Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894 (en)
- Serves six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia (en)
- Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990 (en)
- Serves 11 states: California, Nevada, Utah, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey (en)
- Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635 (en)
- Serves DC and 15 states: Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine (en)
- Unfinished in Nevada; Nevada only; planned in one more: Arizona (en)
- Serves eight states: California, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Florida (en)
- Arizona only (en)
- Associated route: H-201 (en)
- Associated route: I-124 (en)
- Associated route: I-172 (en)
- Associated route: I-182 (en)
- Associated route: I-184 (en)
- Associated route: I-225 (en)
- Associated route: I-277 (en)
- Associated route: I-345 (en)
- Associated route: I-516 (en)
- Associated route: I-587 (en)
- Associated routes: I-115, I-215, I-315 (en)
- Associated routes: I-126, I-526 (en)
- Associated routes: I-129, I-229 (en)
- Associated routes: I-155, I-255, I-355, I-555 (en)
- Associated routes: I-196, I-296, I-496, I-696 (en)
- Associated routes: I-220, I-520, I-820 (en)
- Associated routes: I-244, I-344, I-444 (en)
- Associated routes: I-264, I-464, I-564, I-664 (en)
- Associated routes: I-271, I-471 (en)
- Associated routes: I-291, I-391, I-691 (en)
- Associated routes: I-381, I-481, I-581, I-781 (en)
- Associated routes: I-430, I-530, I-630 (en)
- Associated routes: I-66 Spur in Kentucky (en)
- Florida only (en)
- Follows PR-22 (en)
- Follows PR-52 (en)
- Follows PR-66 (en)
- Georgia only (en)
- Idaho only (en)
- Illinois only (en)
- Longest Interstate highway (en)
- Louisiana only (en)
- Maryland only (en)
- Michigan only (en)
- Serves six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois (en)
- Redesignated as I-84 in 1968 (en)
- Replaced by a northward extension of I-29 (en)
- Served North Dakota only (en)
- Served two states: Connecticut, Massachusetts (en)
- Served two states: Pennsylvania, New Jersey (en)
- Serves DC and one state: Virginia (en)
- Serves three states: New Mexico, Colorado, Wyoming (en)
- Serves three states: Oregon, Idaho, Utah (en)
- Serves three states: Texas, Oklahoma, Missouri (en)
- Serves two states: California, Arizona (en)
- Serves two states: Colorado, Nebraska (en)
- Serves two states: Illinois, Wisconsin (en)
- Serves two states: Kentucky, Ohio (en)
- Serves two states: Maryland, Pennsylvania (en)
- Serves two states: Missouri, Illinois (en)
- Serves two states: New Hampshire, Vermont (en)
- Serves two states: Texas, Arkansas (en)
- Serves two states: Washington, Oregon (en)
- Serves two states: West Virginia, Maryland (en)
- Serves two states: West Virginia, Pennsylvania (en)
- Serves eight states: California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, North Carolina (en)
- Texas only (en)
- Unfinished in Ohio and North Carolina; serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina; planned in three more: West Virginia, Virginia, South Carolina (en)
- Unfinished in North Carolina; North Carolina only (en)
- Unfinished in Texas; Texas only (en)
- Uses kilometers instead of miles (en)
- Associated routes: I-474; Planned: I-274 in North Carolina (en)
- Future Interstate; will serve two states: Oklahoma, Arkansas (en)
- Unfinished in North Carolina; serves three states: Tennessee, North Carolina, South Carolina (en)
- Serves six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan (en)
- Unfinished in Arkansas and Louisiana; serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas (en)
- Serves six states: Texas, Oklahoma, Kansas, Missouri, Iowa, Minnesota (en)
- Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895 (en)
- Serves three states: Ohio, Pennsylvania, New Jersey (en)
- Serves four states: Alabama, Tennessee, Kentucky, Indiana (en)
- Associated routes: I-140, I-240, I-440, I-540, I-640, I-840 (en)
- Serves six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina (en)
- Associated routes: I-69C, I-69E, I-69W, I-169, I-269, I-369, I-469; Planned: I-569 in Kentucky (en)
- Serves three states: Connecticut, Massachusetts, Vermont (en)
- Associated routes: I-175, I-275, I-375, I-475, I-575, I-675 (en)
- Associated routes: I-170, I-270, I-370, I-470, I-670 (en)
- Serves three states: Massachusetts, New Hampshire, Vermont (en)
- Unfinished in Alabama; serves five states: Alabama, Georgia, South Carolina, North Carolina, Virginia (en)
- Unfinished in Pennsylvania; serves two states: Pennsylvania, New York (en)
- Was the initial designation to what is now I-380 and I-80 (en)
- Serves four states: Illinois, Kentucky, Tennessee, Georgia (en)
- Unfinished in Texas; Texas only; planned in four more: Louisiana, Mississippi, Alabama, Georgia (en)
- Unfinished in North Carolina; North Carolina only; planned in one more: Virginia (en)
- Served one state: Connecticut, was planned for one state: Rhode Island (en)
- Unfinished in New York; serves two states: Pennsylvania, New York (en)
- Unfinished in North Carolina; North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan (en)
- Serves seven states: Montana, North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Michigan (en)
- Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-885, I-985; Future/Planned: I-685 in both Alabama and North Carolina (en)
- Serves three states: Pennsylvania, New Jersey, New York (en)
- Unfinished in California; serves six states: California, Nevada, Arizona, Utah, Idaho, Montana (en)
- Serves 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts (en)
- Serves five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio (en)
- Served four states: Kansas, Missouri, Illinois, Kentucky (en)
- Unfinished in Texas; Texas only; planned in one more: New Mexico; Planned associated routes in Texas: I-27E, I-27W, I-27N (en)
- Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky (en)
- Planned associated routes: I-14N, I-14S, and I-214 in Texas (en)
- Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910 (en)
- Unfinished in Alabama; serves two states: Mississippi, Alabama (en)
- Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Planned: I-905 in California (en)
- Serves four states: Missouri, Iowa, South Dakota, North Dakota (en)
- Serves 10 states: Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland (en)
- Serves three states: California, Oregon, Washington (en)
- Unfinished in Missouri and Arkansas; serves three states: Arkansas, Missouri, Illinois. (en)
- The project was unpopular and ultimately cancelled without the interstate being completed; I-66 Spur eventually became I-165 (en)
- Serves six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York (en)
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