| Southborough to Morristown (New Jersey) | 3,500.60 mi (5,633.68 km) |
| Southborough to Morristown (Tennessee) | 4,068.44 mi (6,547.52 km) |
| Southborough to Morrisville (North Carolina) | 3,902.67 mi (6,280.74 km) |
| Southborough to Morro Bay (California) | 5,475.39 mi (8,811.79 km) |
| Southborough to Morton (Illinois) | 4,103.17 mi (6,603.42 km) |
| Southborough to Morton Grove (Illinois) | 3,972.27 mi (6,392.75 km) |
| Southborough to Moscow (Idaho) | 4,717.01 mi (7,591.29 km) |
| Southborough to Moses Lake (Washington) | 4,758.58 mi (7,658.20 km) |
| Southborough to Moss Bluff (Louisiana) | 4,759.47 mi (7,659.63 km) |
| Southborough to Moss Point (Mississippi) | 4,564.16 mi (7,345.31 km) |
| Southborough to Moultrie (Georgia) | 4,331.58 mi (6,971.01 km) |
| Southborough to Mounds View (Minnesota) | 4,030.43 mi (6,486.34 km) |
| Southborough to Mount Airy (North Carolina) | 3,944.68 mi (6,348.35 km) |
| Southborough to Mount Clemens (Michigan) | 3,757.92 mi (6,047.79 km) |
| Southborough to Mount Dora (Florida) | 4,358.01 mi (7,013.54 km) |
