| Westbrook to Mattoon (Illinois) | 972.92 mi (1,565.77 km) |
| Westbrook to Mauldin (South Carolina) | 886.06 mi (1,425.97 km) |
| Westbrook to Maumee (Ohio) | 691.51 mi (1,112.88 km) |
| Westbrook to Maumelle (Arkansas) | 1,322.33 mi (2,128.09 km) |
| Westbrook to Mayagüez (Puerto Rico) | 1,771.45 mi (2,850.88 km) |
| Westbrook to Mayfield Heights (Ohio) | 583.66 mi (939.32 km) |
| Westbrook to Mays Chapel (Maryland) | 438.70 mi (706.03 km) |
| Westbrook to Maywood (California) | 2,621.62 mi (4,219.10 km) |
| Westbrook to Maywood (Illinois) | 893.98 mi (1,438.72 km) |
| Westbrook to McAlester (Oklahoma) | 1,480.08 mi (2,381.95 km) |
| Westbrook to McAllen (Texas) | 1,971.61 mi (3,172.99 km) |
| Westbrook to McCalla (Alabama) | 1,148.96 mi (1,849.07 km) |
| Westbrook to McComb (Mississippi) | 1,392.56 mi (2,241.12 km) |
| Westbrook to McDonough (Georgia) | 1,025.79 mi (1,650.86 km) |
| Westbrook to McFarland (California) | 2,618.57 mi (4,214.18 km) |
