| Potomac to Montevarchi | 4,389.61 mi (7,064.39 km) |
| Potomac to Monticello Conte Otto | 4,320.04 mi (6,952.43 km) |
| Potomac to Montichiari | 4,275.47 mi (6,880.70 km) |
| Potomac to Montignoso | 4,312.05 mi (6,939.58 km) |
| Potomac to Montopoli in Val d'Arno | 4,349.21 mi (6,999.38 km) |
| Potomac to Monza | 4,222.22 mi (6,795.01 km) |
| Potomac to Morbegno | 4,217.13 mi (6,786.81 km) |
| Potomac to Mori | 4,286.36 mi (6,898.23 km) |
| Potomac to Morlupo | 4,478.81 mi (7,207.94 km) |
| Potomac to Morrovalle | 4,484.19 mi (7,216.60 km) |
| Potomac to Mortara | 4,210.40 mi (6,775.98 km) |
| Potomac to Mosciano Sant'Angelo | 4,517.39 mi (7,270.03 km) |
| Potomac to Motta di Livenza | 4,357.22 mi (7,012.27 km) |
| Potomac to Motta Sant'Anastasia | 4,760.61 mi (7,661.46 km) |
| Potomac to Mottola | 4,732.98 mi (7,617.00 km) |
