| Potomac to Horizon West (Florida) | 773.10 mi (1,244.19 km) |
| Potomac to Hormigueros (Puerto Rico) | 1,563.63 mi (2,516.42 km) |
| Potomac to Horn Lake (Mississippi) | 762.19 mi (1,226.62 km) |
| Potomac to Hot Springs (Arkansas) | 930.27 mi (1,497.12 km) |
| Potomac to Hot Springs Village (Arkansas) | 921.11 mi (1,482.38 km) |
| Potomac to Houma (Louisiana) | 1,007.77 mi (1,621.84 km) |
| Potomac to Houston (Texas) | 1,214.04 mi (1,953.81 km) |
| Potomac to Howard (Wisconsin) | 679.20 mi (1,093.06 km) |
| Potomac to Huber Heights (Ohio) | 373.69 mi (601.40 km) |
| Potomac to Hudson (Florida) | 800.65 mi (1,288.52 km) |
| Potomac to Hudson (Ohio) | 271.94 mi (437.64 km) |
| Potomac to Hudson (Wisconsin) | 895.50 mi (1,441.17 km) |
| Potomac to Hueytown (Alabama) | 669.63 mi (1,077.67 km) |
| Potomac to Hugo (Minnesota) | 911.07 mi (1,466.23 km) |
| Potomac to Humacao (Puerto Rico) | 1,594.86 mi (2,566.67 km) |
