| Merthyr Tudful to Reidsville (North Carolina) | 3,752.14 mi (6,038.48 km) |
| Merthyr Tudful to Reisterstown (Maryland) | 3,493.22 mi (5,621.80 km) |
| Merthyr Tudful to Rendon (Texas) | 4,642.17 mi (7,470.85 km) |
| Merthyr Tudful to Reno (Nevada) | 5,065.25 mi (8,151.73 km) |
| Merthyr Tudful to Renton (Washington) | 4,687.94 mi (7,544.51 km) |
| Merthyr Tudful to Republic (Missouri) | 4,265.32 mi (6,864.37 km) |
| Merthyr Tudful to Reston (Virginia) | 3,537.49 mi (5,693.04 km) |
| Merthyr Tudful to Revere (Massachusetts) | 3,128.34 mi (5,034.58 km) |
| Merthyr Tudful to Rexburg (Idaho) | 4,578.03 mi (7,367.63 km) |
| Merthyr Tudful to Reynoldsburg (Ohio) | 3,712.91 mi (5,975.35 km) |
| Merthyr Tudful to Rialto (California) | 5,292.16 mi (8,516.91 km) |
| Merthyr Tudful to Richardson (Texas) | 4,601.56 mi (7,405.49 km) |
| Merthyr Tudful to Richfield (Minnesota) | 3,890.27 mi (6,260.79 km) |
| Merthyr Tudful to Richfield (Wisconsin) | 3,777.29 mi (6,078.96 km) |
| Merthyr Tudful to Richland (Washington) | 4,673.10 mi (7,520.63 km) |
