| Merthyr Tudful to Shoreview (Minnesota) | 3,875.33 mi (6,236.75 km) |
| Merthyr Tudful to Shorewood (Illinois) | 3,854.78 mi (6,203.67 km) |
| Merthyr Tudful to Shorewood (Wisconsin) | 3,770.36 mi (6,067.81 km) |
| Merthyr Tudful to Short Hills (New Jersey) | 3,335.30 mi (5,367.65 km) |
| Merthyr Tudful to Short Pump (Virginia) | 3,607.02 mi (5,804.94 km) |
| Merthyr Tudful to Show Low (Arizona) | 5,031.17 mi (8,096.88 km) |
| Merthyr Tudful to Shreveport (Louisiana) | 4,512.51 mi (7,262.19 km) |
| Merthyr Tudful to Sicklerville (New Jersey) | 3,405.67 mi (5,480.89 km) |
| Merthyr Tudful to Sidney (Ohio) | 3,752.56 mi (6,039.17 km) |
| Merthyr Tudful to Sierra Madre (California) | 5,311.20 mi (8,547.54 km) |
| Merthyr Tudful to Sierra Vista (Arizona) | 5,188.13 mi (8,349.48 km) |
| Merthyr Tudful to Sierra Vista Southeast (Arizona) | 5,190.57 mi (8,353.42 km) |
| Merthyr Tudful to Signal Hill (California) | 5,335.72 mi (8,587.01 km) |
| Merthyr Tudful to Sikeston (Missouri) | 4,127.04 mi (6,641.84 km) |
| Merthyr Tudful to Siloam Springs (Arkansas) | 4,354.90 mi (7,008.54 km) |
