| Keystone to Cadiz | 4,377.35 mi (7,044.66 km) |
| Keystone to Calafell | 4,683.94 mi (7,538.07 km) |
| Keystone to Calahorra | 4,487.31 mi (7,221.63 km) |
| Keystone to Calasparra | 4,583.53 mi (7,376.49 km) |
| Keystone to Calatayud | 4,522.38 mi (7,278.06 km) |
| Keystone to Caldas de Montbuy | 4,703.71 mi (7,569.89 km) |
| Keystone to Caldas de Reyes | 4,152.47 mi (6,682.75 km) |
| Keystone to Calella | 4,728.33 mi (7,609.51 km) |
| Keystone to Callosa de Segura | 4,628.18 mi (7,448.34 km) |
| Keystone to Calpe | 4,664.03 mi (7,506.04 km) |
| Keystone to Calvia | 4,767.61 mi (7,672.73 km) |
| Keystone to Camas | 4,374.43 mi (7,039.96 km) |
| Keystone to Cambados | 4,145.91 mi (6,672.20 km) |
| Keystone to Cambre | 4,157.78 mi (6,691.30 km) |
| Keystone to Cambrils | 4,661.56 mi (7,502.05 km) |
