| Koper to Cividale del Friuli | 40.65 mi (65.43 km) |
| Koper to Civita Castellana | 234.26 mi (377.00 km) |
| Koper to Civitanova Marche | 155.46 mi (250.19 km) |
| Koper to Civitavecchia | 257.09 mi (413.75 km) |
| Koper to Civitella in Val di Chiana | 177.77 mi (286.10 km) |
| Koper to Clusone | 183.94 mi (296.02 km) |
| Koper to Coccaglio | 181.65 mi (292.34 km) |
| Koper to Codigoro | 92.99 mi (149.66 km) |
| Koper to Codogno | 197.41 mi (317.70 km) |
| Koper to Codroipo | 46.19 mi (74.34 km) |
| Koper to Cogoleto | 261.23 mi (420.41 km) |
| Koper to Colle di Val d'Elsa | 196.19 mi (315.73 km) |
| Koper to Colle Salvetti | 209.11 mi (336.53 km) |
| Koper to Collecchio | 180.03 mi (289.74 km) |
| Koper to Colleferro | 266.13 mi (428.29 km) |
