| Southborough to Monticello (Minnesota) | 4,042.59 mi (6,505.93 km) |
| Southborough to Montrose (Colorado) | 4,879.51 mi (7,852.82 km) |
| Southborough to Moody (Alabama) | 4,323.77 mi (6,958.43 km) |
| Southborough to Moore (Oklahoma) | 4,668.87 mi (7,513.81 km) |
| Southborough to Moorestown-Lenola (New Jersey) | 3,556.58 mi (5,723.76 km) |
| Southborough to Mooresville (North Carolina) | 3,996.64 mi (6,431.97 km) |
| Southborough to Moorhead (Minnesota) | 4,071.69 mi (6,552.76 km) |
| Southborough to Moorpark (California) | 5,476.00 mi (8,812.77 km) |
| Southborough to Moraga (California) | 5,370.36 mi (8,642.75 km) |
| Southborough to Moreno Valley (California) | 5,442.85 mi (8,759.43 km) |
| Southborough to Morgan City (Louisiana) | 4,709.01 mi (7,578.42 km) |
| Southborough to Morgan Hill (California) | 5,397.32 mi (8,686.15 km) |
| Southborough to Morganton (North Carolina) | 4,025.13 mi (6,477.82 km) |
| Southborough to Morgantown (West Virginia) | 3,773.87 mi (6,073.46 km) |
| Southborough to Morris (Illinois) | 4,027.77 mi (6,482.06 km) |
