| Potomac to Morris (Illinois) | 614.53 mi (988.99 km) |
| Potomac to Morristown (New Jersey) | 189.48 mi (304.94 km) |
| Potomac to Morristown (Tennessee) | 386.37 mi (621.80 km) |
| Potomac to Morrisville (North Carolina) | 237.26 mi (381.83 km) |
| Potomac to Morro Bay (California) | 2,392.96 mi (3,851.10 km) |
| Potomac to Morton (Illinois) | 660.08 mi (1,062.29 km) |
| Potomac to Morton Grove (Illinois) | 593.93 mi (955.84 km) |
| Potomac to Moscow (Idaho) | 2,060.99 mi (3,316.84 km) |
| Potomac to Moses Lake (Washington) | 2,168.38 mi (3,489.67 km) |
| Potomac to Moss Bluff (Louisiana) | 1,088.36 mi (1,751.55 km) |
| Potomac to Moss Point (Mississippi) | 874.23 mi (1,406.94 km) |
| Potomac to Moultrie (Georgia) | 657.43 mi (1,058.03 km) |
| Potomac to Mounds View (Minnesota) | 920.77 mi (1,481.84 km) |
| Potomac to Mount Airy (North Carolina) | 254.71 mi (409.92 km) |
| Potomac to Mount Clemens (Michigan) | 386.87 mi (622.61 km) |
