| Boulder to Bicaz | 5,725.83 mi (9,214.83 km) |
| Boulder to Bistrita | 5,669.40 mi (9,124.01 km) |
| Boulder to Blaj | 5,705.95 mi (9,182.84 km) |
| Boulder to Bocsa | 5,685.27 mi (9,149.56 km) |
| Boulder to Boldesti-Scaeni | 5,830.10 mi (9,382.65 km) |
| Boulder to Bolintin Vale | 5,855.17 mi (9,422.99 km) |
| Boulder to Borsa | 5,644.91 mi (9,084.61 km) |
| Boulder to Botosani | 5,694.18 mi (9,163.90 km) |
| Boulder to Brad | 5,675.98 mi (9,134.61 km) |
| Boulder to Bragadiru | 5,865.70 mi (9,439.94 km) |
| Boulder to Braila | 5,869.99 mi (9,446.84 km) |
| Boulder to Brasov | 5,782.63 mi (9,306.25 km) |
| Boulder to Breaza | 5,810.85 mi (9,351.67 km) |
| Boulder to Bucharest | 5,865.90 mi (9,440.25 km) |
| Boulder to Buftea | 5,853.76 mi (9,420.72 km) |
