| Risca to Mauldin (South Carolina) | 3,948.01 mi (6,353.70 km) |
| Risca to Maumee (Ohio) | 3,689.87 mi (5,938.27 km) |
| Risca to Maumelle (Arkansas) | 4,352.63 mi (7,004.88 km) |
| Risca to Mayagüez (Puerto Rico) | 4,131.96 mi (6,649.75 km) |
| Risca to Mayfield Heights (Ohio) | 3,604.56 mi (5,800.98 km) |
| Risca to Mays Chapel (Maryland) | 3,501.93 mi (5,635.81 km) |
| Risca to Maywood (California) | 5,341.31 mi (8,596.01 km) |
| Risca to Maywood (Illinois) | 3,838.97 mi (6,178.23 km) |
| Risca to McAlester (Oklahoma) | 4,481.11 mi (7,211.66 km) |
| Risca to McAllen (Texas) | 5,027.58 mi (8,091.11 km) |
| Risca to McCalla (Alabama) | 4,213.18 mi (6,780.46 km) |
| Risca to McComb (Mississippi) | 4,455.24 mi (7,170.02 km) |
| Risca to McDonough (Georgia) | 4,088.46 mi (6,579.74 km) |
| Risca to McFarland (California) | 5,280.16 mi (8,497.60 km) |
| Risca to McHenry (Illinois) | 3,835.28 mi (6,172.29 km) |
