| Merthyr Tudful to Alum Rock (California) | 5,249.93 mi (8,448.95 km) |
| Merthyr Tudful to Alvin (Texas) | 4,729.54 mi (7,611.46 km) |
| Merthyr Tudful to Amarillo (Texas) | 4,682.83 mi (7,536.29 km) |
| Merthyr Tudful to Amelia (Ohio) | 3,812.58 mi (6,135.76 km) |
| Merthyr Tudful to American Canyon (California) | 5,216.88 mi (8,395.76 km) |
| Merthyr Tudful to American Fork (Utah) | 4,761.87 mi (7,663.49 km) |
| Merthyr Tudful to Americus (Georgia) | 4,143.62 mi (6,668.51 km) |
| Merthyr Tudful to Ames (Iowa) | 4,036.22 mi (6,495.67 km) |
| Merthyr Tudful to Amherst (Ohio) | 3,625.67 mi (5,834.96 km) |
| Merthyr Tudful to Ammon (Idaho) | 4,601.78 mi (7,405.85 km) |
| Merthyr Tudful to Amsterdam (New York) | 3,236.95 mi (5,209.36 km) |
| Merthyr Tudful to Anacortes (Washington) | 4,643.27 mi (7,472.62 km) |
| Merthyr Tudful to Anaheim (California) | 5,323.39 mi (8,567.18 km) |
| Merthyr Tudful to Anchorage (Alaska) | 4,410.88 mi (7,098.62 km) |
| Merthyr Tudful to Anderson (California) | 5,088.29 mi (8,188.81 km) |
