| Mason City to Cadillac (Michigan) | 396.00 mi (637.31 km) |
| Mason City to Caguas (Puerto Rico) | 2,338.75 mi (3,763.85 km) |
| Mason City to Cahokia (Illinois) | 353.79 mi (569.37 km) |
| Mason City to Calabasas (California) | 1,501.05 mi (2,415.70 km) |
| Mason City to Caldwell (Idaho) | 1,174.34 mi (1,889.92 km) |
| Mason City to Caledonia (Wisconsin) | 270.16 mi (434.78 km) |
| Mason City to Calera (Alabama) | 775.70 mi (1,248.38 km) |
| Mason City to Calexico (California) | 1,407.41 mi (2,265.01 km) |
| Mason City to Calhoun (Georgia) | 744.55 mi (1,198.24 km) |
| Mason City to California (Maryland) | 934.74 mi (1,504.32 km) |
| Mason City to California City (California) | 1,425.83 mi (2,294.64 km) |
| Mason City to Callaway (Florida) | 992.92 mi (1,597.94 km) |
| Mason City to Calumet City (Illinois) | 307.14 mi (494.29 km) |
| Mason City to Calverton (Maryland) | 890.32 mi (1,432.83 km) |
| Mason City to Camano (Washington) | 1,445.99 mi (2,327.10 km) |
