| Boulogne-sur-Mer to Cassino | 863.18 mi (1,389.15 km) |
| Boulogne-sur-Mer to Castagneto Carducci | 671.64 mi (1,080.90 km) |
| Boulogne-sur-Mer to Castano Primo | 486.04 mi (782.21 km) |
| Boulogne-sur-Mer to Castel Bolognese | 648.52 mi (1,043.70 km) |
| Boulogne-sur-Mer to Castel Gandolfo | 812.57 mi (1,307.70 km) |
| Boulogne-sur-Mer to Castel Goffredo | 554.63 mi (892.59 km) |
| Boulogne-sur-Mer to Castel Maggiore | 621.29 mi (999.87 km) |
| Boulogne-sur-Mer to Castel Mella | 533.63 mi (858.80 km) |
| Boulogne-sur-Mer to Castel San Giorgio | 929.98 mi (1,496.65 km) |
| Boulogne-sur-Mer to Castel San Giovanni | 533.33 mi (858.31 km) |
| Boulogne-sur-Mer to Castel San Pietro Terme | 637.00 mi (1,025.15 km) |
| Boulogne-sur-Mer to Castel Volturno | 890.42 mi (1,432.99 km) |
| Boulogne-sur-Mer to Castelbuono | 1,074.82 mi (1,729.75 km) |
| Boulogne-sur-Mer to Casteldaccia | 1,052.30 mi (1,693.51 km) |
| Boulogne-sur-Mer to Castelfidardo | 751.16 mi (1,208.88 km) |
