States by the number of x0 US highways that have passed through it at its peak:
5
- California (40, 50, 60, 70, 80)
- Illinois (20, 30, 40, 50, 60)
4
- Indiana (20, 30, 40, 50)
- Ohio (20, 30, 40, 50)
- Texas (60, 70, 80, 90)
- West Virginia (30, 40, 50, 60)
3
- Arizona (60, 70, 80)
- Idaho (10, 20, 30)
- Missouri (40, 50, 60)
- New Mexico (60, 70, 80)
- Pennsylvania (20, 30, 40)
- Utah (30, 40, 50)
2
- Alabama (80, 90)
- Colorado (40, 50)
- Iowa (20, 30)
- Kansas (40, 50)
- Nebraska (20, 30)
- New Jersey (30, 40)
- Louisiana (80, 90)
- Maryland (40, 50)
- Mississippi (80, 90)
- Nevada (40, 50)
- Oklahoma (60, 70)
- Oregon (20, 30)
- Virginia (50, 60)
- Wyoming (20, 30)
1
- Arkansas (70)
- DC (50)
- Delaware (40)
- Florida (90)
- Georgia (80)
- Kentucky (60)
- Massachusetts (20)
- Michigan (10)
- Minnesota (10)
- Montana (10)
- New York (20)
- North Carolina (70)
- North Dakota (10)
- Tennessee (70)
- Washington (10)
- Wisconsin (10)
0
- Alaska
- Connecticut
- Hawaii
- New Hampshire
- Maine
- Rhode Island
- South Carolina
- South Dakota
- Vermont