| Merthyr Tudful to Washington (Indiana) | 3,946.52 mi (6,351.30 km) |
| Merthyr Tudful to Washington (Missouri) | 4,102.78 mi (6,602.78 km) |
| Merthyr Tudful to Washington (Pennsylvania) | 3,600.92 mi (5,795.12 km) |
| Merthyr Tudful to Washington (Utah) | 4,994.48 mi (8,037.84 km) |
| Merthyr Tudful to Washington Court House (Ohio) | 3,757.39 mi (6,046.94 km) |
| Merthyr Tudful to Washougal (Washington) | 4,798.69 mi (7,722.75 km) |
| Merthyr Tudful to Watauga (Texas) | 4,627.80 mi (7,447.73 km) |
| Merthyr Tudful to Waterbury (Connecticut) | 3,247.50 mi (5,226.35 km) |
| Merthyr Tudful to Waterloo (Illinois) | 4,079.34 mi (6,565.06 km) |
| Merthyr Tudful to Waterloo (Iowa) | 3,966.79 mi (6,383.94 km) |
| Merthyr Tudful to Watertown (New York) | 3,263.71 mi (5,252.44 km) |
| Merthyr Tudful to Watertown (South Dakota) | 4,028.02 mi (6,482.47 km) |
| Merthyr Tudful to Watertown (Wisconsin) | 3,797.98 mi (6,112.25 km) |
| Merthyr Tudful to Watertown Town (Massachusetts) | 3,137.47 mi (5,049.27 km) |
| Merthyr Tudful to Waterville (Maine) | 2,988.67 mi (4,809.80 km) |
