| Potomac to Hazelwood (Missouri) | 709.05 mi (1,141.11 km) |
| Potomac to Hazleton (Pennsylvania) | 148.60 mi (239.16 km) |
| Potomac to Healdsburg (California) | 2,432.24 mi (3,914.31 km) |
| Potomac to Heath (Ohio) | 288.19 mi (463.79 km) |
| Potomac to Heber (Utah) | 1,808.25 mi (2,910.10 km) |
| Potomac to Helena (Alabama) | 669.21 mi (1,077.00 km) |
| Potomac to Helena (Montana) | 1,824.78 mi (2,936.71 km) |
| Potomac to Hemet (California) | 2,226.16 mi (3,582.65 km) |
| Potomac to Henderson (Kentucky) | 567.65 mi (913.54 km) |
| Potomac to Henderson (Nevada) | 2,069.45 mi (3,330.46 km) |
| Potomac to Henderson (North Carolina) | 197.39 mi (317.66 km) |
| Potomac to Henderson (Texas) | 1,094.09 mi (1,760.77 km) |
| Potomac to Hendersonville (North Carolina) | 385.81 mi (620.90 km) |
| Potomac to Hendersonville (Tennessee) | 547.09 mi (880.45 km) |
| Potomac to Hercules (California) | 2,411.99 mi (3,881.73 km) |
