| Middletown to Maryland Heights (Missouri) | 331.90 mi (534.14 km) |
| Middletown to Marysville (California) | 1,974.90 mi (3,178.30 km) |
| Middletown to Marysville (Ohio) | 73.18 mi (117.77 km) |
| Middletown to Marysville (Washington) | 1,953.50 mi (3,143.86 km) |
| Middletown to Maryville (Missouri) | 559.28 mi (900.08 km) |
| Middletown to Maryville (Tennessee) | 260.41 mi (419.09 km) |
| Middletown to Mason (Ohio) | 10.66 mi (17.15 km) |
| Middletown to Mason City (Iowa) | 522.60 mi (841.05 km) |
| Middletown to Massapequa (New York) | 581.15 mi (935.28 km) |
| Middletown to Massapequa Park (New York) | 582.33 mi (937.16 km) |
| Middletown to Massillon (Ohio) | 174.16 mi (280.28 km) |
| Middletown to Mastic (New York) | 614.43 mi (988.83 km) |
| Middletown to Mastic Beach (New York) | 614.77 mi (989.37 km) |
| Middletown to Matteson (Illinois) | 225.27 mi (362.53 km) |
| Middletown to Matthews (North Carolina) | 363.38 mi (584.80 km) |
