| Merthyr Tudful to Rancho Cordova (California) | 5,163.68 mi (8,310.15 km) |
| Merthyr Tudful to Rancho Cucamonga (California) | 5,297.66 mi (8,525.75 km) |
| Merthyr Tudful to Rancho Mirage (California) | 5,279.82 mi (8,497.06 km) |
| Merthyr Tudful to Rancho Palos Verdes (California) | 5,344.87 mi (8,601.74 km) |
| Merthyr Tudful to Rancho San Diego (California) | 5,352.60 mi (8,614.17 km) |
| Merthyr Tudful to Rancho Santa Margarita (California) | 5,326.47 mi (8,572.12 km) |
| Merthyr Tudful to Randallstown (Maryland) | 3,496.41 mi (5,626.92 km) |
| Merthyr Tudful to Rantoul (Illinois) | 3,908.66 mi (6,290.39 km) |
| Merthyr Tudful to Rapid City (South Dakota) | 4,280.81 mi (6,889.30 km) |
| Merthyr Tudful to Ravenna (Ohio) | 3,597.02 mi (5,788.85 km) |
| Merthyr Tudful to Raymondville (Texas) | 4,980.75 mi (8,015.75 km) |
| Merthyr Tudful to Raymore (Missouri) | 4,223.02 mi (6,796.29 km) |
| Merthyr Tudful to Raytown (Missouri) | 4,213.89 mi (6,781.60 km) |
| Merthyr Tudful to Reading (Ohio) | 3,811.93 mi (6,134.71 km) |
| Merthyr Tudful to Reading (Pennsylvania) | 3,418.07 mi (5,500.85 km) |
