| Gretna to Cocentaina | 4,942.83 mi (7,954.71 km) |
| Gretna to Coin | 4,782.89 mi (7,697.32 km) |
| Gretna to Colindres | 4,675.69 mi (7,524.79 km) |
| Gretna to Collado-Villalba | 4,717.51 mi (7,592.09 km) |
| Gretna to Colmenar Viejo | 4,728.69 mi (7,610.09 km) |
| Gretna to Colmenarejo | 4,718.92 mi (7,594.36 km) |
| Gretna to Conil de la Frontera | 4,724.78 mi (7,603.80 km) |
| Gretna to Consuegra | 4,767.25 mi (7,672.14 km) |
| Gretna to Corbera de Llobregat | 4,981.55 mi (8,017.03 km) |
| Gretna to Cordoba | 4,749.51 mi (7,643.60 km) |
| Gretna to Coria del Rio | 4,700.39 mi (7,564.55 km) |
| Gretna to Crevillente | 4,938.54 mi (7,947.82 km) |
| Gretna to Cuarte de Huerva | 4,841.91 mi (7,792.31 km) |
| Gretna to Cubellas | 4,975.27 mi (8,006.93 km) |
| Gretna to Cuellar | 4,683.48 mi (7,537.34 km) |
