| Potomac to Mechernich | 3,963.33 mi (6,378.37 km) |
| Potomac to Meckenbeuren | 4,167.55 mi (6,707.02 km) |
| Potomac to Meckenheim | 3,977.15 mi (6,400.60 km) |
| Potomac to Meerane | 4,186.05 mi (6,736.79 km) |
| Potomac to Meerbusch | 3,945.81 mi (6,350.16 km) |
| Potomac to Meine | 4,065.37 mi (6,542.57 km) |
| Potomac to Meinerzhagen | 3,988.33 mi (6,418.60 km) |
| Potomac to Meiningen | 4,115.02 mi (6,622.48 km) |
| Potomac to Meissen | 4,215.59 mi (6,784.34 km) |
| Potomac to Meitingen | 4,193.76 mi (6,749.21 km) |
| Potomac to Melle | 3,985.87 mi (6,414.63 km) |
| Potomac to Melsungen | 4,063.58 mi (6,539.71 km) |
| Potomac to Memmelsdorf | 4,155.07 mi (6,686.94 km) |
| Potomac to Memmingen | 4,184.15 mi (6,733.75 km) |
| Potomac to Mendig | 3,994.99 mi (6,429.32 km) |
