| Mason City to Sudbury | 4,106.71 mi (6,609.12 km) |
| Mason City to Sunbury | 4,087.68 mi (6,578.48 km) |
| Mason City to Sunderland | 3,930.68 mi (6,325.81 km) |
| Mason City to Sunninghill | 4,079.97 mi (6,566.07 km) |
| Mason City to Surbiton | 4,093.01 mi (6,587.07 km) |
| Mason City to Sutton | 4,098.10 mi (6,595.26 km) |
| Mason City to Sutton Coldfield | 3,995.99 mi (6,430.92 km) |
| Mason City to Sutton in Ashfield | 3,996.44 mi (6,431.65 km) |
| Mason City to Sutton on Hull | 4,007.19 mi (6,448.96 km) |
| Mason City to Swadlincote | 3,998.15 mi (6,434.40 km) |
| Mason City to Swallownest | 3,985.84 mi (6,414.60 km) |
| Mason City to Swanage | 4,060.44 mi (6,534.65 km) |
| Mason City to Swindon | 4,032.99 mi (6,490.47 km) |
| Mason City to Swinton | 3,981.83 mi (6,408.14 km) |
| Mason City to Swinton | 3,944.45 mi (6,347.98 km) |
