| Mason City to Sestu | 4,958.26 mi (7,979.55 km) |
| Mason City to Settimo Torinese | 4,646.15 mi (7,477.25 km) |
| Mason City to Seveso | 4,675.27 mi (7,524.13 km) |
| Mason City to Sezze | 5,011.75 mi (8,065.64 km) |
| Mason City to Siano | 5,106.45 mi (8,218.04 km) |
| Mason City to Siena | 4,861.85 mi (7,824.39 km) |
| Mason City to Signa | 4,831.94 mi (7,776.26 km) |
| Mason City to Silea | 4,790.90 mi (7,710.20 km) |
| Mason City to Silvi Paese | 5,001.84 mi (8,049.68 km) |
| Mason City to Sinalunga | 4,881.64 mi (7,856.24 km) |
| Mason City to Siniscola | 4,924.11 mi (7,924.60 km) |
| Mason City to Sinnai | 4,962.58 mi (7,986.50 km) |
| Mason City to Siracusa | 5,309.24 mi (8,544.39 km) |
| Mason City to Solaro | 4,674.53 mi (7,522.93 km) |
| Mason City to Soliera | 4,782.11 mi (7,696.06 km) |
