| Southborough to Manerbio | 604.24 mi (972.44 km) |
| Southborough to Manfredonia | 991.03 mi (1,594.91 km) |
| Southborough to Maniago | 663.46 mi (1,067.74 km) |
| Southborough to Mantova | 637.21 mi (1,025.48 km) |
| Southborough to Maranello | 670.56 mi (1,079.16 km) |
| Southborough to Marano di Napoli | 970.62 mi (1,562.06 km) |
| Southborough to Marano Vicentino | 634.86 mi (1,021.70 km) |
| Southborough to Marcianise | 967.24 mi (1,556.62 km) |
| Southborough to Marcon | 673.41 mi (1,083.74 km) |
| Southborough to Mareno di Piave | 663.00 mi (1,066.99 km) |
| Southborough to Margherita di Savoia | 1,012.74 mi (1,629.85 km) |
| Southborough to Mariano Comense | 555.58 mi (894.13 km) |
| Southborough to Marigliano | 977.53 mi (1,573.18 km) |
| Southborough to Marino | 874.91 mi (1,408.03 km) |
| Southborough to Marostica | 641.01 mi (1,031.61 km) |
