| Potomac to Maricopa (Arizona) | 1,975.65 mi (3,179.50 km) |
| Potomac to Marietta (Georgia) | 537.14 mi (864.45 km) |
| Potomac to Marietta (Ohio) | 229.35 mi (369.10 km) |
| Potomac to Marina (California) | 2,414.03 mi (3,885.00 km) |
| Potomac to Marinette (Wisconsin) | 679.45 mi (1,093.46 km) |
| Potomac to Marion (Arkansas) | 762.91 mi (1,227.78 km) |
| Potomac to Marion (Illinois) | 641.99 mi (1,033.18 km) |
| Potomac to Marion (Indiana) | 461.67 mi (742.99 km) |
| Potomac to Marion (Iowa) | 783.14 mi (1,260.34 km) |
| Potomac to Marion (Ohio) | 333.06 mi (536.01 km) |
| Potomac to Marion Oaks (Florida) | 748.44 mi (1,204.50 km) |
| Potomac to Markham (Illinois) | 580.73 mi (934.60 km) |
| Potomac to Marlborough (Massachusetts) | 374.91 mi (603.36 km) |
| Potomac to Marlton (New Jersey) | 135.48 mi (218.04 km) |
| Potomac to Marquette (Michigan) | 732.99 mi (1,179.63 km) |
