| Merthyr Tudful to Wanaque (New Jersey) | 3,320.71 mi (5,344.16 km) |
| Merthyr Tudful to Wantagh (New York) | 3,304.70 mi (5,318.41 km) |
| Merthyr Tudful to Warner Robins (Georgia) | 4,094.48 mi (6,589.42 km) |
| Merthyr Tudful to Warr Acres (Oklahoma) | 4,506.63 mi (7,252.72 km) |
| Merthyr Tudful to Warren (Michigan) | 3,608.87 mi (5,807.91 km) |
| Merthyr Tudful to Warren (Ohio) | 3,576.61 mi (5,756.00 km) |
| Merthyr Tudful to Warrensburg (Missouri) | 4,197.04 mi (6,754.49 km) |
| Merthyr Tudful to Warrensville Heights (Ohio) | 3,596.01 mi (5,787.22 km) |
| Merthyr Tudful to Warrenville (Illinois) | 3,839.69 mi (6,179.39 km) |
| Merthyr Tudful to Warrington (Florida) | 4,353.85 mi (7,006.85 km) |
| Merthyr Tudful to Warsaw (Indiana) | 3,775.25 mi (6,075.67 km) |
| Merthyr Tudful to Warwick (Rhode Island) | 3,175.40 mi (5,110.32 km) |
| Merthyr Tudful to Wasco (California) | 5,273.59 mi (8,487.03 km) |
| Merthyr Tudful to Washington (District of Columbia) | 3,525.95 mi (5,674.47 km) |
| Merthyr Tudful to Washington (Illinois) | 3,939.48 mi (6,339.99 km) |
