| South River to Mattoon (Illinois) | 742.80 mi (1,195.42 km) |
| South River to Mauldin (South Carolina) | 583.71 mi (939.39 km) |
| South River to Maumee (Ohio) | 490.07 mi (788.69 km) |
| South River to Maumelle (Arkansas) | 1,056.49 mi (1,700.26 km) |
| South River to Mayagüez (Puerto Rico) | 1,596.17 mi (2,568.78 km) |
| South River to Mayfield Heights (Ohio) | 376.28 mi (605.56 km) |
| South River to Mays Chapel (Maryland) | 139.22 mi (224.05 km) |
| South River to Maywood (California) | 2,426.10 mi (3,904.43 km) |
| South River to Maywood (Illinois) | 706.67 mi (1,137.28 km) |
| South River to McAlester (Oklahoma) | 1,226.82 mi (1,974.37 km) |
| South River to McAllen (Texas) | 1,683.10 mi (2,708.69 km) |
| South River to McCalla (Alabama) | 854.50 mi (1,375.19 km) |
| South River to McComb (Mississippi) | 1,100.12 mi (1,770.48 km) |
| South River to McDonough (Georgia) | 724.08 mi (1,165.29 km) |
| South River to McFarland (California) | 2,436.36 mi (3,920.94 km) |
