| Keystone to Collegno | 4,878.78 mi (7,851.63 km) |
| Keystone to Cologno al Serio | 4,962.28 mi (7,986.01 km) |
| Keystone to Cologno Monzese | 4,944.75 mi (7,957.80 km) |
| Keystone to Colorno | 5,010.05 mi (8,062.90 km) |
| Keystone to Comacchio | 5,097.50 mi (8,203.63 km) |
| Keystone to Comiso | 5,441.08 mi (8,756.57 km) |
| Keystone to Como | 4,928.95 mi (7,932.38 km) |
| Keystone to Concordia Sagittaria | 5,097.40 mi (8,203.47 km) |
| Keystone to Concorezzo | 4,945.77 mi (7,959.45 km) |
| Keystone to Conegliano | 5,069.70 mi (8,158.90 km) |
| Keystone to Conselice | 5,086.82 mi (8,186.44 km) |
| Keystone to Conselve | 5,068.57 mi (8,157.07 km) |
| Keystone to Conversano | 5,434.46 mi (8,745.92 km) |
| Keystone to Copertino | 5,500.35 mi (8,851.96 km) |
| Keystone to Copparo | 5,076.24 mi (8,169.42 km) |
