| Rhondda to Monticello (Minnesota) | 3,892.78 mi (6,264.83 km) |
| Rhondda to Montrose (Colorado) | 4,733.36 mi (7,617.60 km) |
| Rhondda to Moody (Alabama) | 4,163.44 mi (6,700.40 km) |
| Rhondda to Moore (Oklahoma) | 4,513.66 mi (7,264.03 km) |
| Rhondda to Moorestown-Lenola (New Jersey) | 3,395.64 mi (5,464.75 km) |
| Rhondda to Mooresville (North Carolina) | 3,835.60 mi (6,172.80 km) |
| Rhondda to Moorhead (Minnesota) | 3,925.30 mi (6,317.16 km) |
| Rhondda to Moorpark (California) | 5,336.09 mi (8,587.61 km) |
| Rhondda to Moraga (California) | 5,236.89 mi (8,427.96 km) |
| Rhondda to Moreno Valley (California) | 5,301.03 mi (8,531.19 km) |
| Rhondda to Morgan City (Louisiana) | 4,548.76 mi (7,320.52 km) |
| Rhondda to Morgan Hill (California) | 5,262.70 mi (8,469.50 km) |
| Rhondda to Morganton (North Carolina) | 3,864.31 mi (6,219.00 km) |
| Rhondda to Morgantown (West Virginia) | 3,613.96 mi (5,816.11 km) |
| Rhondda to Morris (Illinois) | 3,871.92 mi (6,231.26 km) |
