| Merthyr Tudful to Tulare (California) | 5,238.44 mi (8,430.45 km) |
| Merthyr Tudful to Tullahoma (Tennessee) | 4,065.12 mi (6,542.18 km) |
| Merthyr Tudful to Tulsa (Oklahoma) | 4,410.69 mi (7,098.32 km) |
| Merthyr Tudful to Tumwater (Washington) | 4,735.25 mi (7,620.64 km) |
| Merthyr Tudful to Tupelo (Mississippi) | 4,220.15 mi (6,791.67 km) |
| Merthyr Tudful to Turlock (California) | 5,212.30 mi (8,388.39 km) |
| Merthyr Tudful to Tuscaloosa (Alabama) | 4,222.12 mi (6,794.85 km) |
| Merthyr Tudful to Tustin (California) | 5,327.93 mi (8,574.47 km) |
| Merthyr Tudful to Twentynine Palms (California) | 5,246.18 mi (8,442.90 km) |
| Merthyr Tudful to Twin Falls (Idaho) | 4,730.33 mi (7,612.73 km) |
| Merthyr Tudful to Twin Rivers (New Jersey) | 3,362.52 mi (5,411.45 km) |
| Merthyr Tudful to Twinsburg (Ohio) | 3,598.00 mi (5,790.41 km) |
| Merthyr Tudful to Two Rivers (Wisconsin) | 3,711.00 mi (5,972.27 km) |
| Merthyr Tudful to Tyler (Texas) | 4,579.79 mi (7,370.45 km) |
| Merthyr Tudful to Tysons (Virginia) | 3,533.87 mi (5,687.21 km) |
