U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
October 26, 2021
Table HM-18
| FUNCTIONAL SYSTEM | FEDERAL-AID HIGHWAYS | NON- FEDERAL-AID HIGHWAYS |
TOTAL | ||||
|---|---|---|---|---|---|---|---|
| NATIONAL HIGHWAY SYSTEM | OTHER | TOTAL | |||||
| INTERSTATE | OTHER | TOTAL | |||||
| Rural: | |||||||
| Principal Arterial: | |||||||
| Interstate | 29,337 | - | 29,337 | - | 29,337 | - | 29,337 |
| Other Freeways and Expressways | - | 6,515 | 6,515 | 42 | 6,557 | - | 6,557 |
| Other | - | 87,789 | 87,789 | 2,994 | 90,783 | - | 90,783 |
| Subtotal | 29,337 | 94,304 | 123,641 | 3,035 | 126,676 | - | 126,676 |
| Minor Arterial | - | 2,635 | 2,635 | 132,226 | 134,861 | - | 134,861 |
| Major Collector | - | 470 | 470 | 407,453 | 407,922 | - | 407,922 |
| Minor Collector | - | 3 | 3 | - | 3 | 259,728 | 259,731 |
| Local | - | 22 | 22 | - | 22 | 2,009,451 | 2,009,473 |
| Total Rural | 29,337 | 97,433 | 126,770 | 542,714 | 669,485 | 2,269,179 | 2,938,663 |
| Small Urban: | - | ||||||
| Principal Arterial: | - | ||||||
| Interstate | 2,820 | - | 2,820 | - | 2,820 | - | 2,820 |
| Other Freeways and Expressways | - | 1,373 | 1,373 | 47 | 1,420 | - | 1,420 |
| Other | - | 11,643 | 11,643 | 1,751 | 13,394 | - | 13,394 |
| Subtotal | 2,820 | 13,016 | 15,836 | 1,797 | 17,633 | - | 17,633 |
| Minor Arterial | - | 407 | 407 | 20,438 | 20,846 | - | 20,846 |
| Major Collector | - | 43 | 43 | 28,362 | 28,405 | - | 28,405 |
| Minor Collector | - | 9 | 9 | 5,457 | 5,465 | - | 5,465 |
| Local | - | 15 | 15 | - | 15 | 154,465 | 154,480 |
| Total Small Urban | 2,820 | 13,491 | 16,311 | 56,054 | 72,365 | 154,465 | 226,830 |
| Urbanized: | - | ||||||
| Principal Arterial: | - | ||||||
| Interstate | 16,599 | - | 16,599 | - | 16,599 | - | 16,599 |
| Other Freeways and Expressways | - | 10,577 | 10,577 | 155 | 10,733 | - | 10,733 |
| Other | - | 48,224 | 48,224 | 5,247 | 53,471 | - | 53,471 |
| Subtotal | 16,599 | 58,801 | 75,400 | 5,402 | 80,803 | - | 80,803 |
| Minor Arterial | - | 1,485 | 1,485 | 90,498 | 91,983 | - | 91,983 |
| Major Collector | - | 402 | 402 | 103,009 | 103,411 | - | 103,411 |
| Minor Collector | - | 34 | 34 | 15,720 | 15,753 | - | 15,753 |
| Local | - | 113 | 113 | - | 113 | 734,922 | 735,035 |
| Total Urbanized | 16,599 | 60,834 | 77,434 | 214,629 | 292,063 | 734,922 | 1,026,985 |
| Total Urban: | - | ||||||
| Principal Arterial: | - | ||||||
| Interstate | 19,419 | - | 19,419 | - | 19,419 | - | 19,419 |
| Other Freeways And Expressways | - | 11,951 | 11,951 | 202 | 12,153 | - | 12,153 |
| Other | - | 59,867 | 59,867 | 6,998 | 66,865 | - | 66,865 |
| Subtotal | 19,419 | 71,818 | 91,237 | 7,200 | 98,436 | - | 98,436 |
| Minor Arterial | - | 1,892 | 1,892 | 110,937 | 112,829 | - | 112,829 |
| Major Collector | - | 446 | 446 | 131,371 | 131,816 | - | 131,816 |
| Minor Collector | - | 43 | 43 | 21,176 | 21,219 | - | 21,219 |
| Local | - | 128 | 128 | - | 128 | 889,387 | 889,515 |
| Total Urban | 19,419 | 74,325 | 93,744 | 270,683 | 364,428 | 889,387 | 1,253,815 |
| Total Rural and Urban | 48,756 | 171,759 | 220,515 | 813,398 | 1,033,912 | 3,158,566 | 4,192,479 |
(1) Includes the 50 States, Puerto Rico, and the District of Columbia.
