| Potomac to Montgomeryville (Pennsylvania) | 134.54 mi (216.52 km) |
| Potomac to Monticello (Minnesota) | 952.45 mi (1,532.82 km) |
| Potomac to Montrose (Colorado) | 1,645.12 mi (2,647.57 km) |
| Potomac to Moody (Alabama) | 638.38 mi (1,027.38 km) |
| Potomac to Moore (Oklahoma) | 1,142.66 mi (1,838.93 km) |
| Potomac to Moorestown-Lenola (New Jersey) | 135.88 mi (218.67 km) |
| Potomac to Mooresville (North Carolina) | 309.78 mi (498.54 km) |
| Potomac to Moorhead (Minnesota) | 1,123.60 mi (1,808.26 km) |
| Potomac to Moorpark (California) | 2,313.27 mi (3,722.84 km) |
| Potomac to Moraga (California) | 2,408.10 mi (3,875.47 km) |
| Potomac to Moreno Valley (California) | 2,232.57 mi (3,592.98 km) |
| Potomac to Morgan City (Louisiana) | 1,023.15 mi (1,646.59 km) |
| Potomac to Morgan Hill (California) | 2,396.93 mi (3,857.49 km) |
| Potomac to Morganton (North Carolina) | 335.11 mi (539.31 km) |
| Potomac to Morgantown (West Virginia) | 153.28 mi (246.68 km) |
