| Willimantic to Mattoon (Illinois) | 859.99 mi (1,384.02 km) |
| Willimantic to Mauldin (South Carolina) | 726.70 mi (1,169.52 km) |
| Willimantic to Maumee (Ohio) | 590.96 mi (951.07 km) |
| Willimantic to Maumelle (Arkansas) | 1,189.50 mi (1,914.31 km) |
| Willimantic to Mayagüez (Puerto Rico) | 1,652.18 mi (2,658.93 km) |
| Willimantic to Mayfield Heights (Ohio) | 477.36 mi (768.23 km) |
| Willimantic to Mays Chapel (Maryland) | 281.32 mi (452.74 km) |
| Willimantic to Maywood (California) | 2,533.43 mi (4,077.16 km) |
| Willimantic to Maywood (Illinois) | 804.19 mi (1,294.22 km) |
| Willimantic to McAlester (Oklahoma) | 1,355.38 mi (2,181.28 km) |
| Willimantic to McAllen (Texas) | 1,824.00 mi (2,935.44 km) |
| Willimantic to McCalla (Alabama) | 996.51 mi (1,603.73 km) |
| Willimantic to McComb (Mississippi) | 1,241.78 mi (1,998.46 km) |
| Willimantic to McDonough (Georgia) | 867.09 mi (1,395.44 km) |
| Willimantic to McFarland (California) | 2,538.19 mi (4,084.83 km) |
