| Middlesex to Maryland Heights (Missouri) | 858.22 mi (1,381.17 km) |
| Middlesex to Marysville (California) | 2,468.81 mi (3,973.17 km) |
| Middlesex to Marysville (Ohio) | 466.51 mi (750.78 km) |
| Middlesex to Marysville (Washington) | 2,372.03 mi (3,817.41 km) |
| Middlesex to Maryville (Missouri) | 1,068.56 mi (1,719.68 km) |
| Middlesex to Maryville (Tennessee) | 612.94 mi (986.44 km) |
| Middlesex to Mason (Ohio) | 525.51 mi (845.72 km) |
| Middlesex to Mason City (Iowa) | 976.34 mi (1,571.27 km) |
| Middlesex to Massapequa (New York) | 54.43 mi (87.59 km) |
| Middlesex to Massapequa Park (New York) | 55.63 mi (89.54 km) |
| Middlesex to Massillon (Ohio) | 368.25 mi (592.64 km) |
| Middlesex to Mastic (New York) | 88.12 mi (141.81 km) |
| Middlesex to Mastic Beach (New York) | 88.21 mi (141.97 km) |
| Middlesex to Matteson (Illinois) | 692.59 mi (1,114.62 km) |
| Middlesex to Matthews (North Carolina) | 506.48 mi (815.10 km) |
