| Sioux City to Cernavoda | 5,526.02 mi (8,893.26 km) |
| Sioux City to Chitila | 5,453.46 mi (8,776.49 km) |
| Sioux City to Cisnadie | 5,332.32 mi (8,581.53 km) |
| Sioux City to Cluj-Napoca | 5,259.52 mi (8,464.37 km) |
| Sioux City to Codlea | 5,373.47 mi (8,647.76 km) |
| Sioux City to Comanesti | 5,365.22 mi (8,634.48 km) |
| Sioux City to Comarnic | 5,403.07 mi (8,695.41 km) |
| Sioux City to Constanta | 5,553.61 mi (8,937.67 km) |
| Sioux City to Corabia | 5,445.57 mi (8,763.79 km) |
| Sioux City to Costesti | 5,410.23 mi (8,706.92 km) |
| Sioux City to Covasna | 5,388.17 mi (8,671.42 km) |
| Sioux City to Craiova | 5,394.02 mi (8,680.83 km) |
| Sioux City to Cristuru Secuiesc | 5,329.39 mi (8,576.82 km) |
| Sioux City to Cugir | 5,300.65 mi (8,530.58 km) |
| Sioux City to Cumpana | 5,554.20 mi (8,938.62 km) |
