| Potomac to Sudbury | 3,689.01 mi (5,936.89 km) |
| Potomac to Sunbury | 3,655.99 mi (5,883.75 km) |
| Potomac to Sunderland | 3,547.98 mi (5,709.93 km) |
| Potomac to Sunninghill | 3,647.00 mi (5,869.28 km) |
| Potomac to Surbiton | 3,661.41 mi (5,892.47 km) |
| Potomac to Sutton | 3,666.56 mi (5,900.76 km) |
| Potomac to Sutton Coldfield | 3,575.42 mi (5,754.08 km) |
| Potomac to Sutton in Ashfield | 3,586.63 mi (5,772.13 km) |
| Potomac to Sutton on Hull | 3,611.20 mi (5,811.66 km) |
| Potomac to Swadlincote | 3,581.83 mi (5,764.41 km) |
| Potomac to Swallownest | 3,579.40 mi (5,760.49 km) |
| Potomac to Swanage | 3,610.34 mi (5,810.28 km) |
| Potomac to Swindon | 3,597.60 mi (5,789.77 km) |
| Potomac to Swinton | 3,577.35 mi (5,757.19 km) |
| Potomac to Swinton | 3,536.35 mi (5,691.21 km) |
