| Boulogne-sur-Mer to Castelfiorentino | 658.87 mi (1,060.35 km) |
| Boulogne-sur-Mer to Castelfranco di Sopra | 676.31 mi (1,088.42 km) |
| Boulogne-sur-Mer to Castelfranco di Sotto | 646.73 mi (1,040.82 km) |
| Boulogne-sur-Mer to Castelfranco Emilia | 609.25 mi (980.49 km) |
| Boulogne-sur-Mer to Castelfranco Veneto | 589.09 mi (948.05 km) |
| Boulogne-sur-Mer to Castellabate | 965.69 mi (1,554.12 km) |
| Boulogne-sur-Mer to Castellammare del Golfo | 1,036.40 mi (1,667.92 km) |
| Boulogne-sur-Mer to Castellammare di Stabia | 927.79 mi (1,493.13 km) |
| Boulogne-sur-Mer to Castellamonte | 464.05 mi (746.81 km) |
| Boulogne-sur-Mer to Castellana Grotte | 1,008.01 mi (1,622.24 km) |
| Boulogne-sur-Mer to Castellaneta | 1,012.72 mi (1,629.82 km) |
| Boulogne-sur-Mer to Castellanza | 486.72 mi (783.30 km) |
| Boulogne-sur-Mer to Castellarano | 601.87 mi (968.62 km) |
| Boulogne-sur-Mer to Castelleone | 530.98 mi (854.53 km) |
| Boulogne-sur-Mer to Castelletto sopra Ticino | 473.08 mi (761.36 km) |
