| Sioux City to Cortona | 5,037.76 mi (8,107.49 km) |
| Sioux City to Cosenza | 5,387.97 mi (8,671.09 km) |
| Sioux City to Cossato | 4,791.70 mi (7,711.49 km) |
| Sioux City to Costa Volpino | 4,850.39 mi (7,805.94 km) |
| Sioux City to Creazzo | 4,913.93 mi (7,908.21 km) |
| Sioux City to Crema | 4,856.39 mi (7,815.61 km) |
| Sioux City to Cremona | 4,879.83 mi (7,853.32 km) |
| Sioux City to Crevalcore | 4,939.74 mi (7,949.74 km) |
| Sioux City to Crispiano | 5,359.41 mi (8,625.14 km) |
| Sioux City to Crosia | 5,393.85 mi (8,680.56 km) |
| Sioux City to Crotone | 5,430.92 mi (8,740.21 km) |
| Sioux City to Cuneo | 4,821.60 mi (7,759.61 km) |
| Sioux City to Cuorgne | 4,780.46 mi (7,693.40 km) |
| Sioux City to Cusano Milanino | 4,829.80 mi (7,772.81 km) |
| Sioux City to Cutro | 5,428.47 mi (8,736.28 km) |
