| Merthyr Tudful to Stephenville (Texas) | 4,699.30 mi (7,562.79 km) |
| Merthyr Tudful to Sterling (Colorado) | 4,453.87 mi (7,167.81 km) |
| Merthyr Tudful to Sterling (Illinois) | 3,898.58 mi (6,274.15 km) |
| Merthyr Tudful to Sterling (Virginia) | 3,537.43 mi (5,692.94 km) |
| Merthyr Tudful to Sterling Heights (Michigan) | 3,605.15 mi (5,801.93 km) |
| Merthyr Tudful to Steubenville (Ohio) | 3,608.72 mi (5,807.68 km) |
| Merthyr Tudful to Stevens Point (Wisconsin) | 3,768.59 mi (6,064.96 km) |
| Merthyr Tudful to Stevenson Ranch (California) | 5,316.44 mi (8,555.98 km) |
| Merthyr Tudful to Stillwater (Minnesota) | 3,865.48 mi (6,220.88 km) |
| Merthyr Tudful to Stillwater (Oklahoma) | 4,455.37 mi (7,170.22 km) |
| Merthyr Tudful to Stockbridge (Georgia) | 4,073.15 mi (6,555.11 km) |
| Merthyr Tudful to Stockton (California) | 5,199.48 mi (8,367.75 km) |
| Merthyr Tudful to Stone Ridge (Virginia) | 3,546.99 mi (5,708.33 km) |
| Merthyr Tudful to Stonecrest (Georgia) | 4,061.68 mi (6,536.64 km) |
| Merthyr Tudful to Stony Brook (New York) | 3,278.83 mi (5,276.77 km) |
