| Effingham to Mauldin (South Carolina) | 456.79 mi (735.14 km) |
| Effingham to Maumee (Ohio) | 307.93 mi (495.57 km) |
| Effingham to Maumelle (Arkansas) | 363.37 mi (584.79 km) |
| Effingham to Mayagüez (Puerto Rico) | 1,932.37 mi (3,109.84 km) |
| Effingham to Mayfield Heights (Ohio) | 408.76 mi (657.84 km) |
| Effingham to Mays Chapel (Maryland) | 636.33 mi (1,024.08 km) |
| Effingham to Maywood (California) | 1,674.79 mi (2,695.31 km) |
| Effingham to Maywood (Illinois) | 194.23 mi (312.58 km) |
| Effingham to McAlester (Oklahoma) | 492.41 mi (792.47 km) |
| Effingham to McAllen (Texas) | 1,052.91 mi (1,694.49 km) |
| Effingham to McCalla (Alabama) | 410.82 mi (661.15 km) |
| Effingham to McComb (Mississippi) | 554.86 mi (892.96 km) |
| Effingham to McDonough (Georgia) | 462.59 mi (744.47 km) |
| Effingham to McFarland (California) | 1,693.10 mi (2,724.79 km) |
| Effingham to McHenry (Illinois) | 222.76 mi (358.51 km) |
