| Kastamonu to Bicaz | 539.33 mi (867.97 km) |
| Kastamonu to Bistrita | 606.67 mi (976.34 km) |
| Kastamonu to Blaj | 592.61 mi (953.72 km) |
| Kastamonu to Bocsa | 665.07 mi (1,070.33 km) |
| Kastamonu to Boldesti-Scaeni | 464.37 mi (747.33 km) |
| Kastamonu to Bolintin Vale | 457.63 mi (736.49 km) |
| Kastamonu to Borsa | 623.54 mi (1,003.49 km) |
| Kastamonu to Botosani | 561.85 mi (904.21 km) |
| Kastamonu to Brad | 638.28 mi (1,027.21 km) |
| Kastamonu to Bragadiru | 445.66 mi (717.22 km) |
| Kastamonu to Braila | 397.16 mi (639.17 km) |
| Kastamonu to Brasov | 504.55 mi (811.99 km) |
| Kastamonu to Breaza | 485.33 mi (781.07 km) |
| Kastamonu to Bucharest | 441.74 mi (710.91 km) |
| Kastamonu to Buftea | 452.74 mi (728.61 km) |
