| Potomac to Marly-le-Roi | 3,821.55 mi (6,150.20 km) |
| Potomac to Marmande | 3,853.39 mi (6,201.43 km) |
| Potomac to Maromme | 3,761.84 mi (6,054.10 km) |
| Potomac to Marquette-les-Lille | 3,816.09 mi (6,141.40 km) |
| Potomac to Marseille | 4,123.23 mi (6,635.69 km) |
| Potomac to Martigues | 4,105.37 mi (6,606.96 km) |
| Potomac to Massy | 3,832.54 mi (6,167.87 km) |
| Potomac to Maubeuge | 3,863.31 mi (6,217.40 km) |
| Potomac to Mauguio | 4,052.18 mi (6,521.36 km) |
| Potomac to Mauleon | 3,748.56 mi (6,032.73 km) |
| Potomac to Maurepas | 3,817.95 mi (6,144.39 km) |
| Potomac to Maxeville | 3,996.20 mi (6,431.26 km) |
| Potomac to Mayenne | 3,720.25 mi (5,987.17 km) |
| Potomac to Mazamet | 3,982.10 mi (6,408.57 km) |
| Potomac to Meaux | 3,852.57 mi (6,200.11 km) |
