| Sioux City to Chivasso | 4,798.13 mi (7,721.85 km) |
| Sioux City to Ciampino | 5,130.32 mi (8,256.45 km) |
| Sioux City to Cicciano | 5,242.32 mi (8,436.70 km) |
| Sioux City to Cingoli | 5,078.42 mi (8,172.93 km) |
| Sioux City to Cinisello Balsamo | 4,831.02 mi (7,774.78 km) |
| Sioux City to Cinisi | 5,323.90 mi (8,567.99 km) |
| Sioux City to Cirie | 4,785.49 mi (7,701.50 km) |
| Sioux City to Ciro Marina | 5,417.02 mi (8,717.85 km) |
| Sioux City to Cislago | 4,817.36 mi (7,752.79 km) |
| Sioux City to Cisterna di Latina | 5,148.82 mi (8,286.22 km) |
| Sioux City to Cisternino | 5,360.00 mi (8,626.09 km) |
| Sioux City to Citta di Castello | 5,038.43 mi (8,108.57 km) |
| Sioux City to Citta Sant'Angelo | 5,149.51 mi (8,287.33 km) |
| Sioux City to Cittadella | 4,919.26 mi (7,916.79 km) |
| Sioux City to Cittanova | 5,428.89 mi (8,736.96 km) |
