| Potomac to Manerbio | 4,266.04 mi (6,865.53 km) |
| Potomac to Manfredonia | 4,646.55 mi (7,477.89 km) |
| Potomac to Maniago | 4,348.66 mi (6,998.50 km) |
| Potomac to Mantova | 4,301.09 mi (6,921.94 km) |
| Potomac to Maranello | 4,325.10 mi (6,960.57 km) |
| Potomac to Marano di Napoli | 4,597.73 mi (7,399.33 km) |
| Potomac to Marano Vicentino | 4,310.36 mi (6,936.85 km) |
| Potomac to Marcianise | 4,597.99 mi (7,399.74 km) |
| Potomac to Marcon | 4,351.84 mi (7,003.60 km) |
| Potomac to Mareno di Piave | 4,344.38 mi (6,991.60 km) |
| Potomac to Margherita di Savoia | 4,666.68 mi (7,510.29 km) |
| Potomac to Mariano Comense | 4,214.63 mi (6,782.80 km) |
| Potomac to Marigliano | 4,608.29 mi (7,416.32 km) |
| Potomac to Marino | 4,499.34 mi (7,240.99 km) |
| Potomac to Marostica | 4,318.22 mi (6,949.51 km) |
