| Opoczno to Chivasso | 710.98 mi (1,144.22 km) |
| Opoczno to Ciampino | 754.74 mi (1,214.64 km) |
| Opoczno to Cicciano | 769.58 mi (1,238.52 km) |
| Opoczno to Cingoli | 644.12 mi (1,036.62 km) |
| Opoczno to Cinisello Balsamo | 646.39 mi (1,040.27 km) |
| Opoczno to Cinisi | 977.31 mi (1,572.83 km) |
| Opoczno to Cirie | 719.51 mi (1,157.94 km) |
| Opoczno to Ciro Marina | 843.50 mi (1,357.48 km) |
| Opoczno to Cislago | 650.75 mi (1,047.28 km) |
| Opoczno to Cisterna di Latina | 762.69 mi (1,227.44 km) |
| Opoczno to Cisternino | 747.89 mi (1,203.61 km) |
| Opoczno to Citta di Castello | 662.88 mi (1,066.81 km) |
| Opoczno to Citta Sant'Angelo | 678.62 mi (1,092.13 km) |
| Opoczno to Cittadella | 554.35 mi (892.15 km) |
| Opoczno to Cittanova | 922.93 mi (1,485.32 km) |
