| Merthyr Tudful to Troy (Michigan) | 3,609.63 mi (5,809.14 km) |
| Merthyr Tudful to Troy (Missouri) | 4,080.97 mi (6,567.68 km) |
| Merthyr Tudful to Troy (New York) | 3,224.55 mi (5,189.41 km) |
| Merthyr Tudful to Troy (Ohio) | 3,765.80 mi (6,060.48 km) |
| Merthyr Tudful to Truckee (California) | 5,087.13 mi (8,186.95 km) |
| Merthyr Tudful to Trujillo Alto (Puerto Rico) | 4,065.14 mi (6,542.21 km) |
| Merthyr Tudful to Trumbull Center (Connecticut) | 3,266.91 mi (5,257.58 km) |
| Merthyr Tudful to Trussville (Alabama) | 4,163.80 mi (6,700.98 km) |
| Merthyr Tudful to Tualatin (Oregon) | 4,822.28 mi (7,760.72 km) |
| Merthyr Tudful to Tuckahoe (Virginia) | 3,608.65 mi (5,807.57 km) |
| Merthyr Tudful to Tucker (Georgia) | 4,056.66 mi (6,528.56 km) |
| Merthyr Tudful to Tucson (Arizona) | 5,176.08 mi (8,330.10 km) |
| Merthyr Tudful to Tucson Estates (Arizona) | 5,183.57 mi (8,342.15 km) |
| Merthyr Tudful to Tucson Mountains (Arizona) | 5,176.17 mi (8,330.24 km) |
| Merthyr Tudful to Tukwila (Washington) | 4,690.34 mi (7,548.38 km) |
