| Keystone to Corato | 5,395.48 mi (8,683.18 km) |
| Keystone to Corbetta | 4,930.04 mi (7,934.13 km) |
| Keystone to Corciano | 5,146.07 mi (8,281.79 km) |
| Keystone to Cordenons | 5,084.76 mi (8,183.12 km) |
| Keystone to Cori | 5,218.09 mi (8,397.70 km) |
| Keystone to Coriano | 5,136.91 mi (8,267.06 km) |
| Keystone to Corigliano Calabro | 5,450.02 mi (8,770.96 km) |
| Keystone to Corleone | 5,350.51 mi (8,610.82 km) |
| Keystone to Cormano | 4,939.18 mi (7,948.84 km) |
| Keystone to Cornaredo | 4,934.45 mi (7,941.23 km) |
| Keystone to Cornate d'Adda | 4,950.10 mi (7,966.41 km) |
| Keystone to Cornedo Vicentino | 5,035.10 mi (8,103.21 km) |
| Keystone to Correggio | 5,032.42 mi (8,098.90 km) |
| Keystone to Corridonia | 5,199.21 mi (8,367.32 km) |
| Keystone to Corsico | 4,939.90 mi (7,950.00 km) |
