| Merthyr Tudful to St. Simons (Georgia) | 4,069.35 mi (6,548.99 km) |
| Merthyr Tudful to Stafford (Texas) | 4,728.03 mi (7,609.03 km) |
| Merthyr Tudful to Stallings (North Carolina) | 3,850.38 mi (6,196.59 km) |
| Merthyr Tudful to Stamford (Connecticut) | 3,288.14 mi (5,291.75 km) |
| Merthyr Tudful to Stanford (California) | 5,257.30 mi (8,460.81 km) |
| Merthyr Tudful to Stanton (California) | 5,330.09 mi (8,577.95 km) |
| Merthyr Tudful to Star (Idaho) | 4,731.56 mi (7,614.70 km) |
| Merthyr Tudful to Starkville (Mississippi) | 4,263.82 mi (6,861.95 km) |
| Merthyr Tudful to State College (Pennsylvania) | 3,477.06 mi (5,595.78 km) |
| Merthyr Tudful to Staten Island (New York) | 3,334.65 mi (5,366.61 km) |
| Merthyr Tudful to Statesboro (Georgia) | 4,024.32 mi (6,476.51 km) |
| Merthyr Tudful to Statesville (North Carolina) | 3,827.34 mi (6,159.51 km) |
| Merthyr Tudful to Staunton (Virginia) | 3,643.37 mi (5,863.43 km) |
| Merthyr Tudful to Steamboat Springs (Colorado) | 4,588.36 mi (7,384.24 km) |
| Merthyr Tudful to Steiner Ranch (Texas) | 4,782.28 mi (7,696.33 km) |
