| Opoczno to Cividale del Friuli | 479.66 mi (771.94 km) |
| Opoczno to Civita Castellana | 728.63 mi (1,172.61 km) |
| Opoczno to Civitanova Marche | 636.28 mi (1,023.99 km) |
| Opoczno to Civitavecchia | 755.42 mi (1,215.73 km) |
| Opoczno to Civitella in Val di Chiana | 679.59 mi (1,093.70 km) |
| Opoczno to Clusone | 604.76 mi (973.27 km) |
| Opoczno to Coccaglio | 618.96 mi (996.11 km) |
| Opoczno to Codigoro | 587.93 mi (946.18 km) |
| Opoczno to Codogno | 647.99 mi (1,042.84 km) |
| Opoczno to Codroipo | 500.66 mi (805.74 km) |
| Opoczno to Cogoleto | 722.37 mi (1,162.54 km) |
| Opoczno to Colle di Val d'Elsa | 696.83 mi (1,121.44 km) |
| Opoczno to Colle Salvetti | 704.63 mi (1,133.99 km) |
| Opoczno to Collecchio | 651.49 mi (1,048.48 km) |
| Opoczno to Colleferro | 749.67 mi (1,206.47 km) |
