| Potomac to Miranda de Ebro | 3,760.69 mi (6,052.25 km) |
| Potomac to Mislata | 3,972.49 mi (6,393.10 km) |
| Potomac to Moana | 3,496.11 mi (5,626.45 km) |
| Potomac to Moguer | 3,724.55 mi (5,994.09 km) |
| Potomac to Molina de Segura | 3,977.80 mi (6,401.65 km) |
| Potomac to Molins de Rey | 4,027.98 mi (6,482.41 km) |
| Potomac to Mollerusa | 3,969.31 mi (6,387.98 km) |
| Potomac to Mollet | 4,033.32 mi (6,491.00 km) |
| Potomac to Moncada | 4,033.75 mi (6,491.70 km) |
| Potomac to Moncada | 3,971.29 mi (6,391.17 km) |
| Potomac to Monforte de Lemos | 3,549.16 mi (5,711.81 km) |
| Potomac to Monforte del Cid | 3,991.12 mi (6,423.09 km) |
| Potomac to Mongat | 4,038.59 mi (6,499.49 km) |
| Potomac to Monovar | 3,984.12 mi (6,411.82 km) |
| Potomac to Monserrat | 3,967.10 mi (6,384.43 km) |
