| Potomac to Hillcrest Heights (Maryland) | 17.39 mi (27.98 km) |
| Potomac to Hilliard (Ohio) | 325.49 mi (523.83 km) |
| Potomac to Hillsboro (Oregon) | 2,348.74 mi (3,779.93 km) |
| Potomac to Hillsborough (California) | 2,426.09 mi (3,904.42 km) |
| Potomac to Hillsborough (New Jersey) | 169.89 mi (273.41 km) |
| Potomac to Hilo (Hawaii) | 4,737.00 mi (7,623.47 km) |
| Potomac to Hilton Head Island (South Carolina) | 511.97 mi (823.94 km) |
| Potomac to Hinesville (Georgia) | 555.38 mi (893.80 km) |
| Potomac to Hinsdale (Illinois) | 596.10 mi (959.34 km) |
| Potomac to Hobart (Indiana) | 558.35 mi (898.57 km) |
| Potomac to Hobbs (New Mexico) | 1,511.33 mi (2,432.25 km) |
| Potomac to Hobe Sound (Florida) | 842.40 mi (1,355.71 km) |
| Potomac to Hoboken (New Jersey) | 206.10 mi (331.69 km) |
| Potomac to Hockessin (Delaware) | 96.70 mi (155.62 km) |
| Potomac to Hoffman Estates (Illinois) | 611.94 mi (984.82 km) |
