| Os to Cividale del Friuli | 1,028.47 mi (1,655.17 km) |
| Os to Civita Castellana | 1,272.99 mi (2,048.68 km) |
| Os to Civitanova Marche | 1,219.45 mi (1,962.51 km) |
| Os to Civitavecchia | 1,280.67 mi (2,061.04 km) |
| Os to Civitella in Val di Chiana | 1,190.38 mi (1,915.74 km) |
| Os to Clusone | 1,007.74 mi (1,621.80 km) |
| Os to Coccaglio | 1,029.80 mi (1,657.31 km) |
| Os to Codigoro | 1,098.28 mi (1,767.51 km) |
| Os to Codogno | 1,055.44 mi (1,698.57 km) |
| Os to Codroipo | 1,031.99 mi (1,660.83 km) |
| Os to Cogoleto | 1,102.12 mi (1,773.68 km) |
| Os to Colle di Val d'Elsa | 1,186.42 mi (1,909.36 km) |
| Os to Colle Salvetti | 1,167.65 mi (1,879.14 km) |
| Os to Collecchio | 1,087.11 mi (1,749.53 km) |
| Os to Colleferro | 1,317.20 mi (2,119.82 km) |
