| Mason City to Cocentaina | 4,586.59 mi (7,381.41 km) |
| Mason City to Coin | 4,484.04 mi (7,216.36 km) |
| Mason City to Colindres | 4,271.69 mi (6,874.62 km) |
| Mason City to Collado-Villalba | 4,356.50 mi (7,011.10 km) |
| Mason City to Colmenar Viejo | 4,365.88 mi (7,026.20 km) |
| Mason City to Colmenarejo | 4,359.01 mi (7,015.14 km) |
| Mason City to Conil de la Frontera | 4,440.56 mi (7,146.39 km) |
| Mason City to Consuegra | 4,420.71 mi (7,114.45 km) |
| Mason City to Corbera de Llobregat | 4,574.23 mi (7,361.51 km) |
| Mason City to Cordoba | 4,433.13 mi (7,134.43 km) |
| Mason City to Coria del Rio | 4,400.94 mi (7,082.63 km) |
| Mason City to Crevillente | 4,591.55 mi (7,389.38 km) |
| Mason City to Cuarte de Huerva | 4,449.25 mi (7,160.38 km) |
| Mason City to Cubellas | 4,572.28 mi (7,358.38 km) |
| Mason City to Cuellar | 4,313.13 mi (6,941.31 km) |
