| Cwmbran to Mauldin (South Carolina) | 3,950.02 mi (6,356.95 km) |
| Cwmbran to Maumee (Ohio) | 3,691.41 mi (5,940.74 km) |
| Cwmbran to Maumelle (Arkansas) | 4,354.18 mi (7,007.38 km) |
| Cwmbran to Mayagüez (Puerto Rico) | 4,135.40 mi (6,655.29 km) |
| Cwmbran to Mayfield Heights (Ohio) | 3,606.19 mi (5,803.61 km) |
| Cwmbran to Mays Chapel (Maryland) | 3,503.91 mi (5,638.99 km) |
| Cwmbran to Maywood (California) | 5,341.64 mi (8,596.53 km) |
| Cwmbran to Maywood (Illinois) | 3,840.31 mi (6,180.38 km) |
| Cwmbran to McAlester (Oklahoma) | 4,482.50 mi (7,213.89 km) |
| Cwmbran to McAllen (Texas) | 5,029.29 mi (8,093.86 km) |
| Cwmbran to McCalla (Alabama) | 4,215.07 mi (6,783.50 km) |
| Cwmbran to McComb (Mississippi) | 4,457.08 mi (7,172.97 km) |
| Cwmbran to McDonough (Georgia) | 4,090.47 mi (6,582.97 km) |
| Cwmbran to McFarland (California) | 5,280.36 mi (8,497.92 km) |
| Cwmbran to McHenry (Illinois) | 3,836.57 mi (6,174.36 km) |
