| Potomac to Marsala | 4,633.27 mi (7,456.53 km) |
| Potomac to Marsciano | 4,444.07 mi (7,152.04 km) |
| Potomac to Martano | 4,804.97 mi (7,732.85 km) |
| Potomac to Martellago | 4,346.10 mi (6,994.38 km) |
| Potomac to Martina Franca | 4,743.51 mi (7,633.95 km) |
| Potomac to Martinengo | 4,243.78 mi (6,829.70 km) |
| Potomac to Martinsicuro | 4,514.05 mi (7,264.67 km) |
| Potomac to Mascali | 4,761.65 mi (7,663.14 km) |
| Potomac to Mascalucia | 4,761.85 mi (7,663.46 km) |
| Potomac to Masera di Padova | 4,341.54 mi (6,987.04 km) |
| Potomac to Maserada sul Piave | 4,345.96 mi (6,994.14 km) |
| Potomac to Massa | 4,310.05 mi (6,936.35 km) |
| Potomac to Massa Lombarda | 4,368.76 mi (7,030.84 km) |
| Potomac to Massafra | 4,738.54 mi (7,625.94 km) |
| Potomac to Massalubrense | 4,615.55 mi (7,428.01 km) |
