| Euclid to Cocentaina | 4,118.54 mi (6,628.14 km) |
| Euclid to Coin | 3,989.72 mi (6,420.84 km) |
| Euclid to Colindres | 3,825.12 mi (6,155.94 km) |
| Euclid to Collado-Villalba | 3,889.10 mi (6,258.91 km) |
| Euclid to Colmenar Viejo | 3,899.41 mi (6,275.50 km) |
| Euclid to Colmenarejo | 3,891.11 mi (6,262.14 km) |
| Euclid to Conil de la Frontera | 3,939.88 mi (6,340.62 km) |
| Euclid to Consuegra | 3,946.97 mi (6,352.04 km) |
| Euclid to Corbera de Llobregat | 4,131.40 mi (6,648.85 km) |
| Euclid to Cordoba | 3,945.94 mi (6,350.38 km) |
| Euclid to Coria del Rio | 3,906.28 mi (6,286.54 km) |
| Euclid to Crevillente | 4,119.21 mi (6,629.23 km) |
| Euclid to Cuarte de Huerva | 3,998.07 mi (6,434.27 km) |
| Euclid to Cubellas | 4,127.20 mi (6,642.09 km) |
| Euclid to Cuellar | 3,849.93 mi (6,195.86 km) |
