| Rio Maior to Manerbio | 1,055.76 mi (1,699.08 km) |
| Rio Maior to Manfredonia | 1,310.95 mi (2,109.77 km) |
| Rio Maior to Maniago | 1,190.70 mi (1,916.24 km) |
| Rio Maior to Mantova | 1,082.63 mi (1,742.32 km) |
| Rio Maior to Maranello | 1,076.00 mi (1,731.66 km) |
| Rio Maior to Marano di Napoli | 1,222.65 mi (1,967.66 km) |
| Rio Maior to Marano Vicentino | 1,122.60 mi (1,806.65 km) |
| Rio Maior to Marcianise | 1,228.36 mi (1,976.85 km) |
| Rio Maior to Marcon | 1,160.41 mi (1,867.51 km) |
| Rio Maior to Mareno di Piave | 1,167.87 mi (1,879.50 km) |
| Rio Maior to Margherita di Savoia | 1,323.58 mi (2,130.10 km) |
| Rio Maior to Mariano Comense | 1,019.03 mi (1,639.97 km) |
| Rio Maior to Marigliano | 1,236.46 mi (1,989.89 km) |
| Rio Maior to Marino | 1,143.29 mi (1,839.95 km) |
| Rio Maior to Marostica | 1,133.76 mi (1,824.61 km) |
