| Merthyr Tudful to Tacoma (Washington) | 4,708.28 mi (7,577.24 km) |
| Merthyr Tudful to Tahlequah (Oklahoma) | 4,385.76 mi (7,058.20 km) |
| Merthyr Tudful to Takoma Park (Maryland) | 3,522.00 mi (5,668.11 km) |
| Merthyr Tudful to Talladega (Alabama) | 4,154.21 mi (6,685.55 km) |
| Merthyr Tudful to Tallahassee (Florida) | 4,224.41 mi (6,798.53 km) |
| Merthyr Tudful to Tallmadge (Ohio) | 3,606.79 mi (5,804.57 km) |
| Merthyr Tudful to Tamalpais-Homestead Valley (California) | 5,242.60 mi (8,437.15 km) |
| Merthyr Tudful to Tamarac (Florida) | 4,268.40 mi (6,869.32 km) |
| Merthyr Tudful to Tamiami (Florida) | 4,297.37 mi (6,915.94 km) |
| Merthyr Tudful to Tampa (Florida) | 4,271.18 mi (6,873.80 km) |
| Merthyr Tudful to Tanaina (Alaska) | 4,382.66 mi (7,053.21 km) |
| Merthyr Tudful to Tanque Verde (Arizona) | 5,164.99 mi (8,312.25 km) |
| Merthyr Tudful to Tarboro (North Carolina) | 3,684.59 mi (5,929.77 km) |
| Merthyr Tudful to Tarpon Springs (Florida) | 4,276.80 mi (6,882.84 km) |
| Merthyr Tudful to Tarrytown (New York) | 3,302.48 mi (5,314.83 km) |
