| Sioux City to Cassina de' Pecchi | 4,838.01 mi (7,786.03 km) |
| Sioux City to Cassino | 5,190.55 mi (8,353.39 km) |
| Sioux City to Castagneto Carducci | 4,991.39 mi (8,032.87 km) |
| Sioux City to Castano Primo | 4,814.53 mi (7,748.24 km) |
| Sioux City to Castel Bolognese | 4,982.02 mi (8,017.79 km) |
| Sioux City to Castel Gandolfo | 5,134.79 mi (8,263.64 km) |
| Sioux City to Castel Goffredo | 4,888.37 mi (7,867.07 km) |
| Sioux City to Castel Maggiore | 4,954.59 mi (7,973.65 km) |
| Sioux City to Castel Mella | 4,867.32 mi (7,833.19 km) |
| Sioux City to Castel San Giorgio | 5,257.43 mi (8,461.02 km) |
| Sioux City to Castel San Giovanni | 4,861.63 mi (7,824.04 km) |
| Sioux City to Castel San Pietro Terme | 4,970.24 mi (7,998.84 km) |
| Sioux City to Castel Volturno | 5,215.38 mi (8,393.35 km) |
| Sioux City to Castelbuono | 5,373.88 mi (8,648.43 km) |
| Sioux City to Casteldaccia | 5,346.33 mi (8,604.09 km) |
