| Merthyr Tudful to Willow Grove (Pennsylvania) | 3,393.28 mi (5,460.95 km) |
| Merthyr Tudful to Willowbrook (California) | 5,331.30 mi (8,579.89 km) |
| Merthyr Tudful to Willowick (Ohio) | 3,585.11 mi (5,769.68 km) |
| Merthyr Tudful to Wilmette (Illinois) | 3,810.35 mi (6,132.17 km) |
| Merthyr Tudful to Wilmington (Delaware) | 3,428.38 mi (5,517.45 km) |
| Merthyr Tudful to Wilmington (North Carolina) | 3,777.49 mi (6,079.29 km) |
| Merthyr Tudful to Wilmington (Ohio) | 3,777.48 mi (6,079.26 km) |
| Merthyr Tudful to Wilmington Island (Georgia) | 4,012.02 mi (6,456.72 km) |
| Merthyr Tudful to Wilson (North Carolina) | 3,708.09 mi (5,967.60 km) |
| Merthyr Tudful to Wilsonville (Oregon) | 4,825.91 mi (7,766.54 km) |
| Merthyr Tudful to Wilton Manors (Florida) | 4,265.87 mi (6,865.26 km) |
| Merthyr Tudful to Wimauma (Florida) | 4,280.16 mi (6,888.25 km) |
| Merthyr Tudful to Winchester (Kentucky) | 3,858.85 mi (6,210.22 km) |
| Merthyr Tudful to Winchester (Nevada) | 5,104.45 mi (8,214.82 km) |
| Merthyr Tudful to Winchester (Virginia) | 3,561.43 mi (5,731.56 km) |
