| Merthyr Tudful to Centralia (Illinois) | 4,030.31 mi (6,486.15 km) |
| Merthyr Tudful to Centralia (Washington) | 4,751.71 mi (7,647.14 km) |
| Merthyr Tudful to Centreville (Virginia) | 3,546.24 mi (5,707.12 km) |
| Merthyr Tudful to Ceres (California) | 5,210.40 mi (8,385.32 km) |
| Merthyr Tudful to Cerritos (California) | 5,328.77 mi (8,575.83 km) |
| Merthyr Tudful to Chalco (Nebraska) | 4,170.13 mi (6,711.18 km) |
| Merthyr Tudful to Chalmette (Louisiana) | 4,485.53 mi (7,218.76 km) |
| Merthyr Tudful to Chambersburg (Pennsylvania) | 3,506.59 mi (5,643.32 km) |
| Merthyr Tudful to Chamblee (Georgia) | 4,058.73 mi (6,531.89 km) |
| Merthyr Tudful to Champaign (Illinois) | 3,922.10 mi (6,312.00 km) |
| Merthyr Tudful to Champlin (Minnesota) | 3,880.63 mi (6,245.27 km) |
| Merthyr Tudful to Chandler (Arizona) | 5,148.85 mi (8,286.28 km) |
| Merthyr Tudful to Chanhassen (Minnesota) | 3,901.44 mi (6,278.76 km) |
| Merthyr Tudful to Channahon (Illinois) | 3,860.94 mi (6,213.59 km) |
| Merthyr Tudful to Channelview (Texas) | 4,701.53 mi (7,566.39 km) |
