| Potomac to Belvedere Marittimo | 4,720.35 mi (7,596.68 km) |
| Potomac to Benevento | 4,615.59 mi (7,428.07 km) |
| Potomac to Bergamo | 4,235.59 mi (6,816.53 km) |
| Potomac to Bernalda | 4,725.94 mi (7,605.67 km) |
| Potomac to Bertinoro | 4,392.62 mi (7,069.25 km) |
| Potomac to Besana in Brianza | 4,218.91 mi (6,789.68 km) |
| Potomac to Besozzo | 4,187.76 mi (6,739.55 km) |
| Potomac to Biancavilla | 4,750.31 mi (7,644.88 km) |
| Potomac to Biassono | 4,220.34 mi (6,791.97 km) |
| Potomac to Bibbiano | 4,303.41 mi (6,925.68 km) |
| Potomac to Bibbiena | 4,394.43 mi (7,072.15 km) |
| Potomac to Biella | 4,170.91 mi (6,712.43 km) |
| Potomac to Bisceglie | 4,686.79 mi (7,542.66 km) |
| Potomac to Bisignano | 4,742.67 mi (7,632.59 km) |
| Potomac to Bitetto | 4,705.39 mi (7,572.59 km) |
