| Potomac to Malvern (Arkansas) | 921.70 mi (1,483.33 km) |
| Potomac to Manassas (Virginia) | 24.10 mi (38.78 km) |
| Potomac to Manassas Park (Virginia) | 21.47 mi (34.56 km) |
| Potomac to Manatí (Puerto Rico) | 1,560.57 mi (2,511.50 km) |
| Potomac to Manchester (Missouri) | 716.81 mi (1,153.60 km) |
| Potomac to Manchester (New Hampshire) | 406.21 mi (653.73 km) |
| Potomac to Manchester (Tennessee) | 546.42 mi (879.38 km) |
| Potomac to Manchester (Virginia) | 106.94 mi (172.11 km) |
| Potomac to Mandan (North Dakota) | 1,308.05 mi (2,105.11 km) |
| Potomac to Mandeville (Louisiana) | 943.28 mi (1,518.06 km) |
| Potomac to Mango (Florida) | 816.18 mi (1,313.52 km) |
| Potomac to Manhattan (Kansas) | 1,038.84 mi (1,671.85 km) |
| Potomac to Manhattan (New York) | 210.27 mi (338.40 km) |
| Potomac to Manhattan Beach (California) | 2,297.29 mi (3,697.14 km) |
| Potomac to Manitowoc (Wisconsin) | 645.30 mi (1,038.51 km) |
