| Sioux City to Collegno | 4,791.47 mi (7,711.13 km) |
| Sioux City to Cologno al Serio | 4,847.15 mi (7,800.74 km) |
| Sioux City to Cologno Monzese | 4,834.24 mi (7,779.96 km) |
| Sioux City to Colorno | 4,901.78 mi (7,888.66 km) |
| Sioux City to Comacchio | 4,977.97 mi (8,011.26 km) |
| Sioux City to Comiso | 5,441.43 mi (8,757.14 km) |
| Sioux City to Como | 4,814.50 mi (7,748.18 km) |
| Sioux City to Concordia Sagittaria | 4,951.73 mi (7,969.03 km) |
| Sioux City to Concorezzo | 4,833.58 mi (7,778.90 km) |
| Sioux City to Conegliano | 4,926.54 mi (7,928.50 km) |
| Sioux City to Conselice | 4,973.88 mi (8,004.69 km) |
| Sioux City to Conselve | 4,941.64 mi (7,952.80 km) |
| Sioux City to Conversano | 5,336.91 mi (8,588.92 km) |
| Sioux City to Copertino | 5,405.69 mi (8,699.61 km) |
| Sioux City to Copparo | 4,955.98 mi (7,975.88 km) |
