| Longmont to Cortona | 5,466.33 mi (8,797.20 km) |
| Longmont to Cosenza | 5,818.27 mi (9,363.59 km) |
| Longmont to Cossato | 5,221.05 mi (8,402.46 km) |
| Longmont to Costa Volpino | 5,275.34 mi (8,489.84 km) |
| Longmont to Creazzo | 5,337.06 mi (8,589.17 km) |
| Longmont to Crema | 5,283.50 mi (8,502.98 km) |
| Longmont to Cremona | 5,306.95 mi (8,540.71 km) |
| Longmont to Crevalcore | 5,365.90 mi (8,635.59 km) |
| Longmont to Crispiano | 5,784.22 mi (9,308.80 km) |
| Longmont to Crosia | 5,822.36 mi (9,370.19 km) |
| Longmont to Crotone | 5,859.90 mi (9,430.59 km) |
| Longmont to Cuneo | 5,255.42 mi (8,457.78 km) |
| Longmont to Cuorgne | 5,211.26 mi (8,386.71 km) |
| Longmont to Cusano Milanino | 5,257.32 mi (8,460.83 km) |
| Longmont to Cutro | 5,857.87 mi (9,427.33 km) |
