| Opoczno to Collegno | 727.68 mi (1,171.09 km) |
| Opoczno to Cologno al Serio | 627.72 mi (1,010.21 km) |
| Opoczno to Cologno Monzese | 645.20 mi (1,038.35 km) |
| Opoczno to Colorno | 636.62 mi (1,024.54 km) |
| Opoczno to Comacchio | 593.40 mi (954.98 km) |
| Opoczno to Comiso | 1,035.11 mi (1,665.85 km) |
| Opoczno to Como | 639.11 mi (1,028.55 km) |
| Opoczno to Concordia Sagittaria | 515.10 mi (828.98 km) |
| Opoczno to Concorezzo | 640.29 mi (1,030.45 km) |
| Opoczno to Conegliano | 525.73 mi (846.07 km) |
| Opoczno to Conselice | 613.79 mi (987.80 km) |
| Opoczno to Conselve | 573.69 mi (923.26 km) |
| Opoczno to Conversano | 734.93 mi (1,182.75 km) |
| Opoczno to Copertino | 775.08 mi (1,247.37 km) |
| Opoczno to Copparo | 592.70 mi (953.86 km) |
