| Potomac to Hamtramck (Michigan) | 385.64 mi (620.63 km) |
| Potomac to Hanahan (South Carolina) | 448.66 mi (722.05 km) |
| Potomac to Hanford (California) | 2,308.55 mi (3,715.24 km) |
| Potomac to Hannibal (Missouri) | 759.27 mi (1,221.92 km) |
| Potomac to Hanover (Pennsylvania) | 56.25 mi (90.53 km) |
| Potomac to Hanover Park (Illinois) | 610.24 mi (982.09 km) |
| Potomac to Happy Valley (Oregon) | 2,328.71 mi (3,747.70 km) |
| Potomac to Harker Heights (Texas) | 1,276.99 mi (2,055.12 km) |
| Potomac to Harlingen (Texas) | 1,480.34 mi (2,382.38 km) |
| Potomac to Harper Woods (Michigan) | 382.17 mi (615.04 km) |
| Potomac to Harrisburg (North Carolina) | 318.66 mi (512.84 km) |
| Potomac to Harrisburg (Pennsylvania) | 88.68 mi (142.72 km) |
| Potomac to Harrison (Arkansas) | 890.97 mi (1,433.88 km) |
| Potomac to Harrison (New Jersey) | 200.66 mi (322.93 km) |
| Potomac to Harrison (New York) | 230.37 mi (370.75 km) |
