| Fort Collins to Cortona | 5,445.45 mi (8,763.60 km) |
| Fort Collins to Cosenza | 5,797.47 mi (9,330.13 km) |
| Fort Collins to Cossato | 5,200.25 mi (8,369.00 km) |
| Fort Collins to Costa Volpino | 5,254.23 mi (8,455.86 km) |
| Fort Collins to Creazzo | 5,315.82 mi (8,554.98 km) |
| Fort Collins to Crema | 5,262.54 mi (8,469.24 km) |
| Fort Collins to Cremona | 5,285.98 mi (8,506.97 km) |
| Fort Collins to Crevalcore | 5,344.86 mi (8,601.73 km) |
| Fort Collins to Crispiano | 5,763.03 mi (9,274.70 km) |
| Fort Collins to Crosia | 5,801.44 mi (9,336.51 km) |
| Fort Collins to Crotone | 5,839.00 mi (9,396.96 km) |
| Fort Collins to Cuneo | 5,234.97 mi (8,424.87 km) |
| Fort Collins to Cuorgne | 5,190.57 mi (8,353.42 km) |
| Fort Collins to Cusano Milanino | 5,236.39 mi (8,427.15 km) |
| Fort Collins to Cutro | 5,837.01 mi (9,393.75 km) |
