| Sioux City to Cocentaina | 4,747.00 mi (7,639.57 km) |
| Sioux City to Coin | 4,647.53 mi (7,479.48 km) |
| Sioux City to Colindres | 4,429.64 mi (7,128.82 km) |
| Sioux City to Collado-Villalba | 4,517.02 mi (7,269.45 km) |
| Sioux City to Colmenar Viejo | 4,526.28 mi (7,284.35 km) |
| Sioux City to Colmenarejo | 4,519.59 mi (7,273.58 km) |
| Sioux City to Conil de la Frontera | 4,604.72 mi (7,410.58 km) |
| Sioux City to Consuegra | 4,581.95 mi (7,373.93 km) |
| Sioux City to Corbera de Llobregat | 4,731.34 mi (7,614.36 km) |
| Sioux City to Cordoba | 4,595.90 mi (7,396.38 km) |
| Sioux City to Coria del Rio | 4,564.52 mi (7,345.89 km) |
| Sioux City to Crevillente | 4,752.48 mi (7,648.38 km) |
| Sioux City to Cuarte de Huerva | 4,607.62 mi (7,415.25 km) |
| Sioux City to Cubellas | 4,729.71 mi (7,611.73 km) |
| Sioux City to Cuellar | 4,473.18 mi (7,198.88 km) |
