| Merthyr Tudful to South Plainfield (New Jersey) | 3,345.94 mi (5,384.77 km) |
| Merthyr Tudful to South Portland (Maine) | 3,050.14 mi (4,908.73 km) |
| Merthyr Tudful to South Riding (Virginia) | 3,546.03 mi (5,706.78 km) |
| Merthyr Tudful to South River (New Jersey) | 3,349.99 mi (5,391.28 km) |
| Merthyr Tudful to South Salt Lake (Utah) | 4,747.72 mi (7,640.71 km) |
| Merthyr Tudful to South San Francisco (California) | 5,251.92 mi (8,452.15 km) |
| Merthyr Tudful to South San Jose Hills (California) | 5,315.18 mi (8,553.96 km) |
| Merthyr Tudful to South Sioux City (Nebraska) | 4,118.38 mi (6,627.89 km) |
| Merthyr Tudful to South St. Paul (Minnesota) | 3,880.93 mi (6,245.75 km) |
| Merthyr Tudful to South Valley (New Mexico) | 4,871.12 mi (7,839.31 km) |
| Merthyr Tudful to South Venice (Florida) | 4,317.62 mi (6,948.54 km) |
| Merthyr Tudful to South Whittier (California) | 5,323.82 mi (8,567.86 km) |
| Merthyr Tudful to South Yarmouth (Massachusetts) | 3,126.02 mi (5,030.85 km) |
| Merthyr Tudful to Southaven (Mississippi) | 4,236.68 mi (6,818.28 km) |
| Merthyr Tudful to Southchase (Florida) | 4,207.58 mi (6,771.44 km) |
