| Merthyr Tudful to Waimea (Hawaii) | 7,203.20 mi (11,592.43 km) |
| Merthyr Tudful to Waipahu (Hawaii) | 7,155.96 mi (11,516.41 km) |
| Merthyr Tudful to Waipio (Hawaii) | 7,153.84 mi (11,512.99 km) |
| Merthyr Tudful to Wake Forest (North Carolina) | 3,721.62 mi (5,989.37 km) |
| Merthyr Tudful to Wakefield (Virginia) | 3,538.81 mi (5,695.17 km) |
| Merthyr Tudful to Waldorf (Maryland) | 3,535.19 mi (5,689.34 km) |
| Merthyr Tudful to Walker (Michigan) | 3,692.89 mi (5,943.13 km) |
| Merthyr Tudful to Walker Mill (Maryland) | 3,521.86 mi (5,667.89 km) |
| Merthyr Tudful to Walla Walla (Washington) | 4,657.23 mi (7,495.09 km) |
| Merthyr Tudful to Wallingford Center (Connecticut) | 3,243.13 mi (5,219.32 km) |
| Merthyr Tudful to Wallington (New Jersey) | 3,321.32 mi (5,345.15 km) |
| Merthyr Tudful to Walnut (California) | 5,312.50 mi (8,549.64 km) |
| Merthyr Tudful to Walnut Creek (California) | 5,226.08 mi (8,410.57 km) |
| Merthyr Tudful to Walnut Park (California) | 5,328.18 mi (8,574.87 km) |
| Merthyr Tudful to Waltham (Massachusetts) | 3,139.36 mi (5,052.32 km) |
