| Merthyr Tudful to The Villages (Florida) | 4,206.69 mi (6,770.01 km) |
| Merthyr Tudful to The Woodlands (Texas) | 4,697.79 mi (7,560.37 km) |
| Merthyr Tudful to Thibodaux (Louisiana) | 4,527.69 mi (7,286.61 km) |
| Merthyr Tudful to Thomasville (Georgia) | 4,194.02 mi (6,749.62 km) |
| Merthyr Tudful to Thomasville (North Carolina) | 3,790.22 mi (6,099.76 km) |
| Merthyr Tudful to Thonotosassa (Florida) | 4,262.12 mi (6,859.22 km) |
| Merthyr Tudful to Thornton (Colorado) | 4,551.69 mi (7,325.24 km) |
| Merthyr Tudful to Thousand Oaks (California) | 5,337.05 mi (8,589.16 km) |
| Merthyr Tudful to Three Lakes (Florida) | 4,303.06 mi (6,925.11 km) |
| Merthyr Tudful to Tiffin (Ohio) | 3,676.10 mi (5,916.11 km) |
| Merthyr Tudful to Tifton (Georgia) | 4,144.37 mi (6,669.71 km) |
| Merthyr Tudful to Tigard (Oregon) | 4,819.93 mi (7,756.92 km) |
| Merthyr Tudful to Tillmans Corner (Alabama) | 4,381.67 mi (7,051.62 km) |
| Merthyr Tudful to Timberlake (Virginia) | 3,689.49 mi (5,937.66 km) |
| Merthyr Tudful to Timberlane (Louisiana) | 4,491.47 mi (7,228.33 km) |
