| Potomac to Hagerstown (Maryland) | 51.63 mi (83.08 km) |
| Potomac to Haines City (Florida) | 794.94 mi (1,279.33 km) |
| Potomac to Halawa (Hawaii) | 4,819.47 mi (7,756.18 km) |
| Potomac to Half Moon Bay (California) | 2,432.03 mi (3,913.98 km) |
| Potomac to Halfway (Maryland) | 51.76 mi (83.29 km) |
| Potomac to Hallandale Beach (Florida) | 916.29 mi (1,474.62 km) |
| Potomac to Haltom City (Texas) | 1,199.05 mi (1,929.69 km) |
| Potomac to Ham Lake (Minnesota) | 924.40 mi (1,487.68 km) |
| Potomac to Hamilton (Ohio) | 395.41 mi (636.35 km) |
| Potomac to Hamilton Square (New Jersey) | 159.04 mi (255.95 km) |
| Potomac to Hammond (Indiana) | 571.06 mi (919.03 km) |
| Potomac to Hammond (Louisiana) | 953.36 mi (1,534.28 km) |
| Potomac to Hammonton (New Jersey) | 137.07 mi (220.59 km) |
| Potomac to Hampton (Virginia) | 142.71 mi (229.67 km) |
| Potomac to Hampton Bays (New York) | 278.66 mi (448.46 km) |
