| Potomac to Barberino di Mugello | 4,359.12 mi (7,015.32 km) |
| Potomac to Barcellona-Pozzo di Gotto | 4,747.10 mi (7,639.72 km) |
| Potomac to Bareggio | 4,213.51 mi (6,781.00 km) |
| Potomac to Barga | 4,323.80 mi (6,958.48 km) |
| Potomac to Bari | 4,706.97 mi (7,575.14 km) |
| Potomac to Barletta | 4,674.36 mi (7,522.65 km) |
| Potomac to Baronissi | 4,629.36 mi (7,450.23 km) |
| Potomac to Barrafranca | 4,730.63 mi (7,613.21 km) |
| Potomac to Bassano del Grappa | 4,320.85 mi (6,953.74 km) |
| Potomac to Battipaglia | 4,643.57 mi (7,473.11 km) |
| Potomac to Beinasco | 4,167.25 mi (6,706.54 km) |
| Potomac to Bellinzago Novarese | 4,194.77 mi (6,750.82 km) |
| Potomac to Belluno | 4,328.64 mi (6,966.28 km) |
| Potomac to Belmonte Mezzagno | 4,667.45 mi (7,511.54 km) |
| Potomac to Belpasso | 4,758.17 mi (7,657.54 km) |
