| Southborough to Mitchell (South Dakota) | 4,267.93 mi (6,868.57 km) |
| Southborough to Mitchellville (Maryland) | 3,677.99 mi (5,919.15 km) |
| Southborough to Moberly (Missouri) | 4,273.60 mi (6,877.69 km) |
| Southborough to Mobile (Alabama) | 4,534.53 mi (7,297.63 km) |
| Southborough to Modesto (California) | 5,348.93 mi (8,608.27 km) |
| Southborough to Mokena (Illinois) | 3,999.29 mi (6,436.24 km) |
| Southborough to Moline (Illinois) | 4,101.01 mi (6,599.94 km) |
| Southborough to Moncks Corner (South Carolina) | 4,077.36 mi (6,561.88 km) |
| Southborough to Monfort Heights (Ohio) | 3,981.10 mi (6,406.96 km) |
| Southborough to Monmouth (Oregon) | 4,995.73 mi (8,039.84 km) |
| Southborough to Monroe (Georgia) | 4,200.55 mi (6,760.13 km) |
| Southborough to Monroe (Louisiana) | 4,601.83 mi (7,405.93 km) |
| Southborough to Monroe (Michigan) | 3,808.01 mi (6,128.40 km) |
| Southborough to Monroe (North Carolina) | 4,012.92 mi (6,458.18 km) |
| Southborough to Monroe (Ohio) | 3,959.32 mi (6,371.91 km) |
