| Rhondda to Mendota Heights (Minnesota) | 3,887.97 mi (6,257.09 km) |
| Rhondda to Menifee (California) | 5,313.48 mi (8,551.22 km) |
| Rhondda to Menlo Park (California) | 5,259.73 mi (8,464.72 km) |
| Rhondda to Menomonee Falls (Wisconsin) | 3,779.27 mi (6,082.14 km) |
| Rhondda to Menomonie (Wisconsin) | 3,842.44 mi (6,183.80 km) |
| Rhondda to Mentor (Ohio) | 3,579.12 mi (5,760.03 km) |
| Rhondda to Mequon (Wisconsin) | 3,770.07 mi (6,067.34 km) |
| Rhondda to Merced (California) | 5,216.51 mi (8,395.17 km) |
| Rhondda to Mercedes (Texas) | 5,004.62 mi (8,054.16 km) |
| Rhondda to Mercer Island (Washington) | 4,689.81 mi (7,547.51 km) |
| Rhondda to Mercerville (New Jersey) | 3,372.72 mi (5,427.87 km) |
| Rhondda to Meriden (Connecticut) | 3,239.32 mi (5,213.18 km) |
| Rhondda to Meridian (Idaho) | 4,738.58 mi (7,626.00 km) |
| Rhondda to Meridian (Mississippi) | 4,312.49 mi (6,940.27 km) |
| Rhondda to Merriam (Kansas) | 4,223.97 mi (6,797.82 km) |
