| Merthyr Tudful to University Place (Washington) | 4,712.41 mi (7,583.90 km) |
| Merthyr Tudful to Upland (California) | 5,301.15 mi (8,531.38 km) |
| Merthyr Tudful to Upper Arlington (Ohio) | 3,720.84 mi (5,988.11 km) |
| Merthyr Tudful to Upper Grand Lagoon (Florida) | 4,300.36 mi (6,920.77 km) |
| Merthyr Tudful to Upper Montclair (New Jersey) | 3,325.61 mi (5,352.05 km) |
| Merthyr Tudful to Urbana (Illinois) | 3,919.28 mi (6,307.48 km) |
| Merthyr Tudful to Urbana (Maryland) | 3,520.52 mi (5,665.74 km) |
| Merthyr Tudful to Urbana (Ohio) | 3,744.39 mi (6,026.01 km) |
| Merthyr Tudful to Urbandale (Iowa) | 4,060.56 mi (6,534.85 km) |
| Merthyr Tudful to Utica (New York) | 3,272.45 mi (5,266.50 km) |
| Merthyr Tudful to Uvalde (Texas) | 4,916.26 mi (7,911.95 km) |
| Merthyr Tudful to Vacaville (California) | 5,197.78 mi (8,365.02 km) |
| Merthyr Tudful to Vadnais Heights (Minnesota) | 3,874.36 mi (6,235.19 km) |
| Merthyr Tudful to Vail (Arizona) | 5,176.69 mi (8,331.08 km) |
| Merthyr Tudful to Valdosta (Georgia) | 4,164.39 mi (6,701.95 km) |
