| Westbrook to McHenry (Illinois) | 909.29 mi (1,463.36 km) |
| Westbrook to McKeesport (Pennsylvania) | 539.00 mi (867.43 km) |
| Westbrook to McKinleyville (California) | 2,703.05 mi (4,350.14 km) |
| Westbrook to McKinney (Texas) | 1,588.30 mi (2,556.11 km) |
| Westbrook to McLean (Virginia) | 483.20 mi (777.64 km) |
| Westbrook to McMinnville (Oregon) | 2,560.78 mi (4,121.18 km) |
| Westbrook to McMinnville (Tennessee) | 986.90 mi (1,588.26 km) |
| Westbrook to McNair (Virginia) | 491.15 mi (790.42 km) |
| Westbrook to McPherson (Kansas) | 1,462.65 mi (2,353.90 km) |
| Westbrook to Mead Valley (California) | 2,581.83 mi (4,155.05 km) |
| Westbrook to Meadow Woods (Florida) | 1,221.59 mi (1,965.96 km) |
| Westbrook to Meadowbrook (Virginia) | 571.44 mi (919.65 km) |
| Westbrook to Meadville (Pennsylvania) | 516.86 mi (831.81 km) |
| Westbrook to Mebane (North Carolina) | 706.31 mi (1,136.70 km) |
| Westbrook to Mechanicsville (Virginia) | 556.83 mi (896.13 km) |
