| Potomac to Massarosa | 4,324.32 mi (6,959.32 km) |
| Potomac to Matelica | 4,461.52 mi (7,180.13 km) |
| Potomac to Matera | 4,712.77 mi (7,584.47 km) |
| Potomac to Matino | 4,804.20 mi (7,731.61 km) |
| Potomac to Mazzarino | 4,733.16 mi (7,617.29 km) |
| Potomac to Meda | 4,214.99 mi (6,783.36 km) |
| Potomac to Medesano | 4,286.29 mi (6,898.11 km) |
| Potomac to Medicina | 4,359.75 mi (7,016.35 km) |
| Potomac to Meldola | 4,389.61 mi (7,064.40 km) |
| Potomac to Melegnano | 4,231.60 mi (6,810.11 km) |
| Potomac to Melendugno | 4,803.82 mi (7,731.00 km) |
| Potomac to Melfi | 4,658.59 mi (7,497.28 km) |
| Potomac to Melilli | 4,779.62 mi (7,692.05 km) |
| Potomac to Melito di Napoli | 4,599.33 mi (7,401.90 km) |
| Potomac to Melito di Porto Salvo | 4,781.70 mi (7,695.40 km) |
