| South Portland to Manerbio | 3,790.20 mi (6,099.74 km) |
| South Portland to Manfredonia | 4,172.01 mi (6,714.20 km) |
| South Portland to Maniago | 3,871.19 mi (6,230.08 km) |
| South Portland to Mantova | 3,825.20 mi (6,156.07 km) |
| South Portland to Maranello | 3,849.84 mi (6,195.73 km) |
| South Portland to Marano di Napoli | 4,125.12 mi (6,638.74 km) |
| South Portland to Marano Vicentino | 3,833.70 mi (6,169.74 km) |
| South Portland to Marcianise | 4,125.13 mi (6,638.75 km) |
| South Portland to Marcon | 3,875.00 mi (6,236.21 km) |
| South Portland to Mareno di Piave | 3,867.28 mi (6,223.78 km) |
| South Portland to Margherita di Savoia | 4,192.31 mi (6,746.87 km) |
| South Portland to Mariano Comense | 3,738.82 mi (6,017.05 km) |
| South Portland to Marigliano | 4,135.46 mi (6,655.39 km) |
| South Portland to Marino | 4,026.53 mi (6,480.08 km) |
| South Portland to Marostica | 3,841.44 mi (6,182.20 km) |
