| Castelsarrasin to Bougival | 336.97 mi (542.30 km) |
| Castelsarrasin to Bouguenais | 253.70 mi (408.29 km) |
| Castelsarrasin to Boulogne-Billancourt | 335.68 mi (540.22 km) |
| Castelsarrasin to Boulogne-sur-Mer | 462.59 mi (744.47 km) |
| Castelsarrasin to Bourg-de-Peage | 206.04 mi (331.59 km) |
| Castelsarrasin to Bourg-en-Bresse | 250.49 mi (403.12 km) |
| Castelsarrasin to Bourg-la-Reine | 332.48 mi (535.08 km) |
| Castelsarrasin to Bourg-les-Valence | 196.94 mi (316.94 km) |
| Castelsarrasin to Bourges | 219.39 mi (353.08 km) |
| Castelsarrasin to Bourgoin-Jallieu | 230.44 mi (370.86 km) |
| Castelsarrasin to Bressuire | 208.34 mi (335.29 km) |
| Castelsarrasin to Brest | 402.19 mi (647.27 km) |
| Castelsarrasin to Bretigny-sur-Orge | 320.98 mi (516.57 km) |
| Castelsarrasin to Breuillet | 316.82 mi (509.86 km) |
| Castelsarrasin to Briancon | 278.86 mi (448.78 km) |
