| Keystone to Cortona | 5,128.48 mi (8,253.49 km) |
| Keystone to Cosenza | 5,446.93 mi (8,765.99 km) |
| Keystone to Cossato | 4,893.69 mi (7,875.64 km) |
| Keystone to Costa Volpino | 4,973.72 mi (8,004.42 km) |
| Keystone to Creazzo | 5,043.29 mi (8,116.39 km) |
| Keystone to Crema | 4,967.13 mi (7,993.82 km) |
| Keystone to Cremona | 4,988.98 mi (8,028.99 km) |
| Keystone to Crevalcore | 5,050.49 mi (8,127.97 km) |
| Keystone to Crispiano | 5,451.61 mi (8,773.53 km) |
| Keystone to Crosia | 5,462.89 mi (8,791.67 km) |
| Keystone to Crotone | 5,494.99 mi (8,843.34 km) |
| Keystone to Cuneo | 4,894.86 mi (7,877.51 km) |
| Keystone to Cuorgne | 4,874.65 mi (7,844.99 km) |
| Keystone to Cusano Milanino | 4,939.93 mi (7,950.04 km) |
| Keystone to Cutro | 5,490.26 mi (8,835.72 km) |
