| Duluth to Collegno | 4,439.58 mi (7,144.82 km) |
| Duluth to Cologno al Serio | 4,493.19 mi (7,231.09 km) |
| Duluth to Cologno Monzese | 4,480.62 mi (7,210.86 km) |
| Duluth to Colorno | 4,548.05 mi (7,319.38 km) |
| Duluth to Comacchio | 4,623.26 mi (7,440.42 km) |
| Duluth to Comiso | 5,093.34 mi (8,196.93 km) |
| Duluth to Como | 4,460.70 mi (7,178.80 km) |
| Duluth to Concordia Sagittaria | 4,595.62 mi (7,395.93 km) |
| Duluth to Concorezzo | 4,479.86 mi (7,209.63 km) |
| Duluth to Conegliano | 4,570.64 mi (7,355.74 km) |
| Duluth to Conselice | 4,619.59 mi (7,434.52 km) |
| Duluth to Conselve | 4,586.62 mi (7,381.46 km) |
| Duluth to Conversano | 4,982.31 mi (8,018.26 km) |
| Duluth to Copertino | 5,051.04 mi (8,128.87 km) |
| Duluth to Copparo | 4,601.31 mi (7,405.09 km) |
