| Potomac to Melzo | 4,231.04 mi (6,809.20 km) |
| Potomac to Mendicino | 4,748.44 mi (7,641.88 km) |
| Potomac to Menfi | 4,664.96 mi (7,507.53 km) |
| Potomac to Mentana | 4,489.70 mi (7,225.47 km) |
| Potomac to Merano | 4,266.91 mi (6,866.93 km) |
| Potomac to Merate | 4,225.32 mi (6,800.00 km) |
| Potomac to Mercato San Severino | 4,627.82 mi (7,447.75 km) |
| Potomac to Mercogliano | 4,621.58 mi (7,437.72 km) |
| Potomac to Mesagne | 4,768.97 mi (7,674.91 km) |
| Potomac to Messina | 4,760.69 mi (7,661.60 km) |
| Potomac to Mestre | 4,351.40 mi (7,002.90 km) |
| Potomac to Mestrino | 4,332.82 mi (6,973.01 km) |
| Potomac to Milan | 4,222.38 mi (6,795.27 km) |
| Potomac to Milazzo | 4,745.46 mi (7,637.08 km) |
| Potomac to Minerbio | 4,348.28 mi (6,997.87 km) |
