| Merthyr Tudful to Salisbury (New York) | 3,303.48 mi (5,316.44 km) |
| Merthyr Tudful to Salisbury (North Carolina) | 3,817.20 mi (6,143.19 km) |
| Merthyr Tudful to Salmon Creek (Washington) | 4,800.38 mi (7,725.47 km) |
| Merthyr Tudful to Salt Lake City (Utah) | 4,744.93 mi (7,636.23 km) |
| Merthyr Tudful to Sammamish (Washington) | 4,676.93 mi (7,526.79 km) |
| Merthyr Tudful to San Angelo (Texas) | 4,825.78 mi (7,766.34 km) |
| Merthyr Tudful to San Anselmo (California) | 5,237.67 mi (8,429.21 km) |
| Merthyr Tudful to San Antonio (Texas) | 4,853.96 mi (7,811.70 km) |
| Merthyr Tudful to San Benito (Texas) | 4,993.62 mi (8,036.45 km) |
| Merthyr Tudful to San Bernardino (California) | 5,287.65 mi (8,509.65 km) |
| Merthyr Tudful to San Bruno (California) | 5,253.89 mi (8,455.32 km) |
| Merthyr Tudful to San Buenaventura (California) | 5,343.99 mi (8,600.33 km) |
| Merthyr Tudful to San Carlos (California) | 5,256.19 mi (8,459.03 km) |
| Merthyr Tudful to San Carlos Park (Florida) | 4,321.05 mi (6,954.05 km) |
| Merthyr Tudful to San Clemente (California) | 5,337.10 mi (8,589.22 km) |
