| South Portland to Melzo | 3,755.35 mi (6,043.65 km) |
| South Portland to Mendicino | 4,276.65 mi (6,882.61 km) |
| South Portland to Menfi | 4,198.44 mi (6,756.73 km) |
| South Portland to Mentana | 4,016.57 mi (6,464.05 km) |
| South Portland to Merano | 3,789.51 mi (6,098.63 km) |
| South Portland to Merate | 3,749.41 mi (6,034.09 km) |
| South Portland to Mercato San Severino | 4,154.98 mi (6,686.80 km) |
| South Portland to Mercogliano | 4,148.58 mi (6,676.50 km) |
| South Portland to Mesagne | 4,294.56 mi (6,911.42 km) |
| South Portland to Messina | 4,290.93 mi (6,905.58 km) |
| South Portland to Mestre | 3,874.64 mi (6,235.63 km) |
| South Portland to Mestrino | 3,856.27 mi (6,206.07 km) |
| South Portland to Milan | 3,746.82 mi (6,029.92 km) |
| South Portland to Milazzo | 4,275.92 mi (6,881.43 km) |
| South Portland to Minerbio | 3,872.66 mi (6,232.45 km) |
