| Rhondda to Merrick (New York) | 3,307.97 mi (5,323.67 km) |
| Rhondda to Merrifield (Virginia) | 3,537.50 mi (5,693.06 km) |
| Rhondda to Merrillville (Indiana) | 3,824.38 mi (6,154.74 km) |
| Rhondda to Merritt Island (Florida) | 4,180.25 mi (6,727.46 km) |
| Rhondda to Mesa (Arizona) | 5,141.23 mi (8,274.01 km) |
| Rhondda to Mesquite (Nevada) | 5,038.21 mi (8,108.22 km) |
| Rhondda to Mesquite (Texas) | 4,609.57 mi (7,418.39 km) |
| Rhondda to Metairie (Louisiana) | 4,492.48 mi (7,229.95 km) |
| Rhondda to Methuen Town (Massachusetts) | 3,123.96 mi (5,027.53 km) |
| Rhondda to Metuchen (New Jersey) | 3,346.00 mi (5,384.87 km) |
| Rhondda to Mexico (Missouri) | 4,108.84 mi (6,612.54 km) |
| Rhondda to Miami (Florida) | 4,287.20 mi (6,899.58 km) |
| Rhondda to Miami (Oklahoma) | 4,335.41 mi (6,977.17 km) |
| Rhondda to Miami Beach (Florida) | 4,282.53 mi (6,892.07 km) |
| Rhondda to Miami Gardens (Florida) | 4,280.56 mi (6,888.90 km) |
