| Duluth to Cocentaina | 4,413.86 mi (7,103.42 km) |
| Duluth to Coin | 4,325.43 mi (6,961.10 km) |
| Duluth to Colindres | 4,090.51 mi (6,583.04 km) |
| Duluth to Collado-Villalba | 4,184.45 mi (6,734.22 km) |
| Duluth to Colmenar Viejo | 4,193.34 mi (6,748.53 km) |
| Duluth to Colmenarejo | 4,187.19 mi (6,738.64 km) |
| Duluth to Conil de la Frontera | 4,285.79 mi (6,897.31 km) |
| Duluth to Consuegra | 4,251.49 mi (6,842.11 km) |
| Duluth to Corbera de Llobregat | 4,390.13 mi (7,065.23 km) |
| Duluth to Cordoba | 4,270.83 mi (6,873.23 km) |
| Duluth to Coria del Rio | 4,242.90 mi (6,828.29 km) |
| Duluth to Crevillente | 4,420.88 mi (7,114.72 km) |
| Duluth to Cuarte de Huerva | 4,269.30 mi (6,870.78 km) |
| Duluth to Cubellas | 4,389.16 mi (7,063.66 km) |
| Duluth to Cuellar | 4,139.28 mi (6,661.53 km) |
