| Mason City to Smyrna (Delaware) | 950.19 mi (1,529.18 km) |
| Mason City to Smyrna (Georgia) | 794.00 mi (1,277.82 km) |
| Mason City to Smyrna (Tennessee) | 609.84 mi (981.45 km) |
| Mason City to Snellville (Georgia) | 810.98 mi (1,305.15 km) |
| Mason City to Snoqualmie (Washington) | 1,414.97 mi (2,277.18 km) |
| Mason City to Snyder (Texas) | 833.68 mi (1,341.67 km) |
| Mason City to Socastee (South Carolina) | 1,006.23 mi (1,619.37 km) |
| Mason City to Socorro (Texas) | 1,068.12 mi (1,718.98 km) |
| Mason City to Soddy-Daisy (Tennessee) | 693.51 mi (1,116.10 km) |
| Mason City to Solana Beach (California) | 1,477.22 mi (2,377.36 km) |
| Mason City to Soledad (California) | 1,555.72 mi (2,503.68 km) |
| Mason City to Solon (Ohio) | 612.93 mi (986.41 km) |
| Mason City to Somers Point (New Jersey) | 999.38 mi (1,608.34 km) |
| Mason City to Somerset (Kentucky) | 617.10 mi (993.12 km) |
| Mason City to Somerset (New Jersey) | 977.66 mi (1,573.40 km) |
