| Rhondda to Medford (New York) | 3,277.29 mi (5,274.29 km) |
| Rhondda to Medford (Oregon) | 5,002.42 mi (8,050.62 km) |
| Rhondda to Medina (Ohio) | 3,624.80 mi (5,833.55 km) |
| Rhondda to Medulla (Florida) | 4,253.64 mi (6,845.57 km) |
| Rhondda to Mehlville (Missouri) | 4,079.97 mi (6,566.07 km) |
| Rhondda to Melbourne (Florida) | 4,190.10 mi (6,743.31 km) |
| Rhondda to Melissa (Texas) | 4,581.50 mi (7,373.21 km) |
| Rhondda to Melrose (Massachusetts) | 3,129.93 mi (5,037.13 km) |
| Rhondda to Melrose Park (Illinois) | 3,825.82 mi (6,157.06 km) |
| Rhondda to Melville (New York) | 3,296.43 mi (5,305.10 km) |
| Rhondda to Melvindale (Michigan) | 3,626.13 mi (5,835.70 km) |
| Rhondda to Memphis (Florida) | 4,298.55 mi (6,917.85 km) |
| Rhondda to Memphis (Tennessee) | 4,230.10 mi (6,807.68 km) |
| Rhondda to Menasha (Wisconsin) | 3,743.08 mi (6,023.91 km) |
| Rhondda to Mendota (California) | 5,244.57 mi (8,440.31 km) |
