| Mason City to Security-Widefield (Colorado) | 672.60 mi (1,082.44 km) |
| Mason City to Sedalia (Missouri) | 306.97 mi (494.03 km) |
| Mason City to Sedro-Woolley (Washington) | 1,436.41 mi (2,311.68 km) |
| Mason City to Seguin (Texas) | 973.25 mi (1,566.30 km) |
| Mason City to Selden (New York) | 1,043.91 mi (1,680.01 km) |
| Mason City to Selma (Alabama) | 813.79 mi (1,309.66 km) |
| Mason City to Selma (California) | 1,465.63 mi (2,358.71 km) |
| Mason City to Selma (Texas) | 978.77 mi (1,575.17 km) |
| Mason City to Seminole (Florida) | 1,206.68 mi (1,941.96 km) |
| Mason City to Seven Hills (Ohio) | 601.37 mi (967.81 km) |
| Mason City to Seven Oaks (South Carolina) | 903.36 mi (1,453.81 km) |
| Mason City to Severn (Maryland) | 900.63 mi (1,449.43 km) |
| Mason City to Severna Park (Maryland) | 908.21 mi (1,461.62 km) |
| Mason City to Sevierville (Tennessee) | 716.91 mi (1,153.76 km) |
| Mason City to Seymour (Indiana) | 478.53 mi (770.12 km) |
