| Merthyr Tudful to Town and Country (Missouri) | 4,078.07 mi (6,563.02 km) |
| Merthyr Tudful to Towson (Maryland) | 3,487.90 mi (5,613.24 km) |
| Merthyr Tudful to Tracy (California) | 5,218.06 mi (8,397.66 km) |
| Merthyr Tudful to Traverse City (Michigan) | 3,609.49 mi (5,808.91 km) |
| Merthyr Tudful to Travilah (Maryland) | 3,528.64 mi (5,678.80 km) |
| Merthyr Tudful to Trenton (Michigan) | 3,631.02 mi (5,843.56 km) |
| Merthyr Tudful to Trenton (New Jersey) | 3,375.43 mi (5,432.22 km) |
| Merthyr Tudful to Trenton (Ohio) | 3,801.34 mi (6,117.66 km) |
| Merthyr Tudful to Triangle (Virginia) | 3,554.35 mi (5,720.17 km) |
| Merthyr Tudful to Trinity (Florida) | 4,270.84 mi (6,873.25 km) |
| Merthyr Tudful to Trophy Club (Texas) | 4,618.64 mi (7,432.98 km) |
| Merthyr Tudful to Trotwood (Ohio) | 3,781.17 mi (6,085.21 km) |
| Merthyr Tudful to Troutdale (Oregon) | 4,802.66 mi (7,729.13 km) |
| Merthyr Tudful to Troy (Alabama) | 4,228.78 mi (6,805.56 km) |
| Merthyr Tudful to Troy (Illinois) | 4,050.87 mi (6,519.25 km) |
