Within The Contiguous 48 States
This list includes only primary Interstate highways (those with route numbers less than 100). Most (but not all) three digit Interstates are intrastate. Among the three digit interstates, examples of non-intrastate routes include I-435 in Kansas City, Missouri and Kansas City, Kansas and I-535 which crosses from Duluth into Superior.
| Interstate Highway | State | Route | Length (mi) | Length (km) | Notes |
|---|---|---|---|---|---|
| 04 ! Interstate 4 | Florida | Tampa (I-275) to Daytona Beach (I-95) | 132.3 | 212.9 | |
| 12 ! Interstate 12 | Louisiana | Baton Rouge (I-10) to Slidell (I-10/I-59) | 85.6 | 137.8 | |
| 16 ! Interstate 16 | Georgia | Macon (I-75) to Savannah (Montgomery Street) | 166.8 | 268.4 | |
| 17 ! Interstate 17 | Arizona | Phoenix (I-10) to Flagstaff (I-40) | 145.8 | 234.6 | |
| 19 ! Interstate 19 | Arizona | Nogales (Mexican border) to Tucson (I-10) | 63.4 | 102.0 | Interstate 19 reaches the Mexican border but does not cross any state lines. Onward connection (via Federal 15 to Mexico City) is discontinuous and depends on surface roads at the border. |
| 27 ! Interstate 27 | Texas | Lubbock (US 87) to Amarillo (I-40/US 60/US 87/US 287) | 124.1 | 199.7 | |
| 37 ! Interstate 37 | Texas | Corpus Christi (US 181) to San Antonio (I-35) | 143.0 | 230.1 | |
| 43 ! Interstate 43 | Wisconsin | Beloit (I-39/I-90) to Green Bay (US 41/US 141) | 191.6 | 308.4 | |
| 45 ! Interstate 45 | Texas | Galveston (SH-124) to Dallas (I-30/US 67) | 284.9 | 458.5 | The only two-digit Interstate ending in 5 or 0 to be an intrastate Highway. Such numbers are supposed to be signed to major interstates, which is why it is unusual that this one is intrastate. |
| 49 ! Interstate 49 | Louisiana | Lafayette (I-10/US 167) to Shreveport (I-20) | 208.3 | 335.2 | Planned to reach Kansas City, Missouri |
| 73 ! Interstate 73 | North Carolina | Ellerbe (US 220) to Greensboro (I-40/I-85) | 56.7 | 91.2 | Planned to reach Michigan and South Carolina |
| 86 ! Interstate 86 (west) | Idaho | Heyburn (I-84/US 30) to Pocatello (I-15) | 62.9 | 101.2 | |
| 87 ! Interstate 87 | New York | New York City (I-278) to Champlain (Canadian border) | 333.5 | 536.7 | The longest intrastate Interstate highway, Interstate 87 reaches the Canadian border (continuing as Quebec Autoroute 15 through Montréal to Sainte-Agathe-des-Monts in the Laurentian Mountains), but it does not cross any state lines. |
| 88W ! Interstate 88 (west) | Illinois | Silvis (I-80) to Hillside (I-290) | 140.6 | 226.3 | |
| 88E ! Interstate 88 (east) | New York | Binghamton (I-81) to Schenectady (I-90) | 117.8 | 189.6 | |
| 96 ! Interstate 96 | Michigan | Norton Shores (US 31) to Detroit (I-75) | 192.1 | 309.2 | |
| 97 ! Interstate 97 | Maryland | Annapolis (US 50) to Baltimore (I-695/I-895) | 17.6 | 28.3 | Currently the shortest two-digit interstate highway in the country, the only two-digit interstate highway on the U.S. mainland located entirely within one county, and the only two-digit interstate highway on the U.S. mainland that does not connect to any other two-digit interstate highways. |
| 99 ! Interstate 99 | Pennsylvania | Bedford (I-70/I-76/US 220) to Bellefonte (I-80/US 220) | 85.0 | 136.8 | Interstate 99 may eventually extend through New York via US 15 and Maryland to Interstate 68. Surface roads connect it with the Pennsylvania Turnpike at its current signed south end. |
Additionally, there are four Interstate highways that are almost entirely intrastate:
- Interstate 66 is located almost entirely in Virginia, but it has a very short section in the District of Columbia. I-66 is 75 miles (121 km) in length, with one-half mile (0.8 km) in D.C.
- Interstate 72 is located almost entirely in Illinois, but it has a very short section in Missouri. I-72 is 184 miles (296 km) in length, with two miles (3.2 km) in Missouri.
- Interstate 76 (western section) is located almost entirely in Colorado, but it has a very short section in Nebraska that connects Interstate 80. I-76 is 186 miles (299 km) in length, with less than three miles (4.8 km) in Nebraska.
- Interstate 86 (eastern section) is located almost entirely in New York, but it has a short section in Pennsylvania that connects Interstate 90. I-86 is 177 miles (285 km) in length (in the process of being expanded to 380 miles, 610 km), with less than seven miles (11 km) in Pennsylvania.
Read more about this topic: List Of Intrastate Interstate Highways
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