| Echelon to Cocentaina | 3,863.05 mi (6,216.97 km) |
| Echelon to Coin | 3,716.39 mi (5,980.95 km) |
| Echelon to Colindres | 3,587.13 mi (5,772.92 km) |
| Echelon to Collado-Villalba | 3,635.79 mi (5,851.23 km) |
| Echelon to Colmenar Viejo | 3,646.67 mi (5,868.76 km) |
| Echelon to Colmenarejo | 3,637.42 mi (5,853.85 km) |
| Echelon to Conil de la Frontera | 3,662.25 mi (5,893.83 km) |
| Echelon to Consuegra | 3,688.69 mi (5,936.38 km) |
| Echelon to Corbera de Llobregat | 3,893.45 mi (6,265.90 km) |
| Echelon to Cordoba | 3,678.03 mi (5,919.21 km) |
| Echelon to Coria del Rio | 3,633.22 mi (5,847.11 km) |
| Echelon to Crevillente | 3,860.70 mi (6,213.20 km) |
| Echelon to Cuarte de Huerva | 3,755.36 mi (6,043.67 km) |
| Echelon to Cubellas | 3,887.71 mi (6,256.67 km) |
| Echelon to Cuellar | 3,599.91 mi (5,793.50 km) |
