| River Ridge to Mattoon (Illinois) | 666.00 mi (1,071.82 km) |
| River Ridge to Mauldin (South Carolina) | 569.31 mi (916.21 km) |
| River Ridge to Maumee (Ohio) | 881.70 mi (1,418.97 km) |
| River Ridge to Maumelle (Arkansas) | 361.16 mi (581.23 km) |
| River Ridge to Mayagüez (Puerto Rico) | 1,662.24 mi (2,675.12 km) |
| River Ridge to Mayfield Heights (Ohio) | 936.60 mi (1,507.31 km) |
| River Ridge to Mays Chapel (Maryland) | 1,009.20 mi (1,624.15 km) |
| River Ridge to Maywood (California) | 1,657.38 mi (2,667.29 km) |
| River Ridge to Maywood (Illinois) | 834.19 mi (1,342.50 km) |
| River Ridge to McAlester (Oklahoma) | 471.63 mi (759.01 km) |
| River Ridge to McAllen (Texas) | 552.88 mi (889.78 km) |
| River Ridge to McCalla (Alabama) | 297.57 mi (478.89 km) |
| River Ridge to McComb (Mississippi) | 90.03 mi (144.89 km) |
| River Ridge to McDonough (Georgia) | 430.14 mi (692.25 km) |
| River Ridge to McFarland (California) | 1,724.04 mi (2,774.58 km) |
