| Potomac to Ayamonte | 3,698.75 mi (5,952.57 km) |
| Potomac to Azcoitia | 3,776.19 mi (6,077.19 km) |
| Potomac to Azpeitia | 3,778.22 mi (6,080.45 km) |
| Potomac to Azuqueca de Henares | 3,803.87 mi (6,121.73 km) |
| Potomac to Badajoz | 3,671.72 mi (5,909.07 km) |
| Potomac to Badalona | 4,037.50 mi (6,497.72 km) |
| Potomac to Baena | 3,839.32 mi (6,178.79 km) |
| Potomac to Baeza | 3,870.03 mi (6,228.22 km) |
| Potomac to Bailen | 3,852.33 mi (6,199.72 km) |
| Potomac to Balaguer | 3,960.37 mi (6,373.60 km) |
| Potomac to Banolas | 4,041.17 mi (6,503.64 km) |
| Potomac to Baranain | 3,816.46 mi (6,142.00 km) |
| Potomac to Barbadanes | 3,535.96 mi (5,690.58 km) |
| Potomac to Barbastro | 3,921.54 mi (6,311.12 km) |
| Potomac to Barcelona | 4,036.43 mi (6,496.01 km) |
