| Keystone to Cocentaina | 4,637.05 mi (7,462.62 km) |
| Keystone to Coin | 4,456.84 mi (7,172.59 km) |
| Keystone to Colindres | 4,394.76 mi (7,072.69 km) |
| Keystone to Collado-Villalba | 4,417.35 mi (7,109.04 km) |
| Keystone to Colmenar Viejo | 4,429.10 mi (7,127.94 km) |
| Keystone to Colmenarejo | 4,418.28 mi (7,110.53 km) |
| Keystone to Conil de la Frontera | 4,394.07 mi (7,071.58 km) |
| Keystone to Consuegra | 4,460.29 mi (7,178.14 km) |
| Keystone to Corbera de Llobregat | 4,696.95 mi (7,559.01 km) |
| Keystone to Cordoba | 4,430.76 mi (7,130.62 km) |
| Keystone to Coria del Rio | 4,375.84 mi (7,042.24 km) |
| Keystone to Crevillente | 4,629.06 mi (7,449.75 km) |
| Keystone to Cuarte de Huerva | 4,553.18 mi (7,327.63 km) |
| Keystone to Cubellas | 4,688.86 mi (7,546.00 km) |
| Keystone to Cuellar | 4,387.83 mi (7,061.53 km) |
