| Fort Collins to Castelletto sopra Ticino | 5,209.31 mi (8,383.57 km) |
| Fort Collins to Castelli Calepio | 5,257.03 mi (8,460.37 km) |
| Fort Collins to Castelnovo ne' Monti | 5,332.95 mi (8,582.55 km) |
| Fort Collins to Castelnuovo Berardenga | 5,425.05 mi (8,730.77 km) |
| Fort Collins to Castelnuovo di Porto | 5,520.65 mi (8,884.64 km) |
| Fort Collins to Castelnuovo di Verona | 5,296.44 mi (8,523.79 km) |
| Fort Collins to Castelnuovo Rangone | 5,345.65 mi (8,602.99 km) |
| Fort Collins to Castelvetrano | 5,756.62 mi (9,264.39 km) |
| Fort Collins to Castelvetro di Modena | 5,348.69 mi (8,607.88 km) |
| Fort Collins to Castenaso | 5,366.11 mi (8,635.92 km) |
| Fort Collins to Castenedolo | 5,278.56 mi (8,495.03 km) |
| Fort Collins to Castiglion Fiorentino | 5,439.63 mi (8,754.24 km) |
| Fort Collins to Castiglione del Lago | 5,454.38 mi (8,777.97 km) |
| Fort Collins to Castiglione delle Stiviere | 5,288.97 mi (8,511.77 km) |
| Fort Collins to Castrolibero | 5,794.85 mi (9,325.91 km) |
