| Gretna to Carmona | 4,716.96 mi (7,591.22 km) |
| Gretna to Cartagena | 4,948.14 mi (7,963.26 km) |
| Gretna to Cartama | 4,787.82 mi (7,705.26 km) |
| Gretna to Cartaya | 4,644.07 mi (7,473.91 km) |
| Gretna to Caspe | 4,893.51 mi (7,875.34 km) |
| Gretna to Cassa de la Selva | 5,012.18 mi (8,066.33 km) |
| Gretna to Castalla | 4,935.63 mi (7,943.13 km) |
| Gretna to Castellbisbal | 4,982.23 mi (8,018.13 km) |
| Gretna to Castelldefels | 4,987.61 mi (8,026.78 km) |
| Gretna to Castello de Ampurias | 5,010.80 mi (8,064.11 km) |
| Gretna to Castellon de la Plana | 4,928.10 mi (7,931.02 km) |
| Gretna to Castilleja de la Cuesta | 4,697.84 mi (7,560.45 km) |
| Gretna to Catarroja | 4,926.21 mi (7,927.97 km) |
| Gretna to Catral | 4,941.24 mi (7,952.16 km) |
| Gretna to Caudete | 4,916.96 mi (7,913.09 km) |
