| Duzce to Cortona | 995.39 mi (1,601.93 km) |
| Duzce to Cosenza | 794.43 mi (1,278.51 km) |
| Duzce to Cossato | 1,198.39 mi (1,928.62 km) |
| Duzce to Costa Volpino | 1,109.18 mi (1,785.05 km) |
| Duzce to Creazzo | 1,039.69 mi (1,673.22 km) |
| Duzce to Crema | 1,123.69 mi (1,808.40 km) |
| Duzce to Cremona | 1,104.51 mi (1,777.54 km) |
| Duzce to Crevalcore | 1,046.42 mi (1,684.06 km) |
| Duzce to Crispiano | 728.61 mi (1,172.59 km) |
| Duzce to Crosia | 763.66 mi (1,228.99 km) |
| Duzce to Crotone | 752.62 mi (1,211.22 km) |
| Duzce to Cuneo | 1,220.64 mi (1,964.43 km) |
| Duzce to Cuorgne | 1,221.74 mi (1,966.20 km) |
| Duzce to Cusano Milanino | 1,149.54 mi (1,850.00 km) |
| Duzce to Cutro | 760.45 mi (1,223.82 km) |
