| Boulogne-sur-Mer to Castelli Calepio | 518.59 mi (834.60 km) |
| Boulogne-sur-Mer to Castelnovo ne' Monti | 596.46 mi (959.91 km) |
| Boulogne-sur-Mer to Castelnuovo Berardenga | 689.33 mi (1,109.38 km) |
| Boulogne-sur-Mer to Castelnuovo di Porto | 786.53 mi (1,265.80 km) |
| Boulogne-sur-Mer to Castelnuovo di Verona | 558.05 mi (898.09 km) |
| Boulogne-sur-Mer to Castelnuovo Rangone | 607.67 mi (977.95 km) |
| Boulogne-sur-Mer to Castelvetrano | 1,055.04 mi (1,697.93 km) |
| Boulogne-sur-Mer to Castelvetro di Modena | 610.78 mi (982.96 km) |
| Boulogne-sur-Mer to Castenaso | 627.67 mi (1,010.13 km) |
| Boulogne-sur-Mer to Castenedolo | 540.07 mi (869.16 km) |
| Boulogne-sur-Mer to Castiglion Fiorentino | 702.74 mi (1,130.94 km) |
| Boulogne-sur-Mer to Castiglione del Lago | 717.80 mi (1,155.18 km) |
| Boulogne-sur-Mer to Castiglione delle Stiviere | 550.47 mi (885.89 km) |
| Boulogne-sur-Mer to Castrolibero | 1,058.66 mi (1,703.75 km) |
| Boulogne-sur-Mer to Castrovillari | 1,031.31 mi (1,659.74 km) |
