| Merthyr Tudful to Watervliet (New York) | 3,226.30 mi (5,192.23 km) |
| Merthyr Tudful to Watsonville (California) | 5,273.97 mi (8,487.63 km) |
| Merthyr Tudful to Wauconda (Illinois) | 3,817.00 mi (6,142.86 km) |
| Merthyr Tudful to Waukee (Iowa) | 4,066.45 mi (6,544.31 km) |
| Merthyr Tudful to Waukegan (Illinois) | 3,802.52 mi (6,119.57 km) |
| Merthyr Tudful to Waukesha (Wisconsin) | 3,787.83 mi (6,095.92 km) |
| Merthyr Tudful to Waunakee (Wisconsin) | 3,825.41 mi (6,156.40 km) |
| Merthyr Tudful to Waupun (Wisconsin) | 3,778.31 mi (6,080.60 km) |
| Merthyr Tudful to Wausau (Wisconsin) | 3,752.46 mi (6,039.00 km) |
| Merthyr Tudful to Wauwatosa (Wisconsin) | 3,777.36 mi (6,079.08 km) |
| Merthyr Tudful to Waverly (Iowa) | 3,960.31 mi (6,373.50 km) |
| Merthyr Tudful to Waverly (Michigan) | 3,660.81 mi (5,891.50 km) |
| Merthyr Tudful to Waxahachie (Texas) | 4,635.91 mi (7,460.77 km) |
| Merthyr Tudful to Waxhaw (North Carolina) | 3,862.00 mi (6,215.28 km) |
| Merthyr Tudful to Waycross (Georgia) | 4,108.32 mi (6,611.71 km) |
