| Merthyr Tudful to Commerce City (Colorado) | 4,551.01 mi (7,324.15 km) |
| Merthyr Tudful to Compton (California) | 5,332.60 mi (8,581.99 km) |
| Merthyr Tudful to Comstock Park (Michigan) | 3,687.70 mi (5,934.79 km) |
| Merthyr Tudful to Concord (California) | 5,220.92 mi (8,402.26 km) |
| Merthyr Tudful to Concord (Missouri) | 4,079.08 mi (6,564.64 km) |
| Merthyr Tudful to Concord (New Hampshire) | 3,118.10 mi (5,018.10 km) |
| Merthyr Tudful to Concord (North Carolina) | 3,836.04 mi (6,173.50 km) |
| Merthyr Tudful to Conneaut (Ohio) | 3,536.45 mi (5,691.37 km) |
| Merthyr Tudful to Connersville (Indiana) | 3,820.08 mi (6,147.83 km) |
| Merthyr Tudful to Conroe (Texas) | 4,688.84 mi (7,545.96 km) |
| Merthyr Tudful to Converse (Texas) | 4,843.07 mi (7,794.17 km) |
| Merthyr Tudful to Conway (Arkansas) | 4,329.35 mi (6,967.41 km) |
| Merthyr Tudful to Conway (Florida) | 4,199.25 mi (6,758.04 km) |
| Merthyr Tudful to Conway (South Carolina) | 3,843.27 mi (6,185.14 km) |
| Merthyr Tudful to Conyers (Georgia) | 4,056.85 mi (6,528.87 km) |
