| South Portland to Borsbeek | 3,381.31 mi (5,441.69 km) |
| South Portland to Boussu | 3,373.61 mi (5,429.31 km) |
| South Portland to Braine-l'Alleud | 3,390.44 mi (5,456.39 km) |
| South Portland to Braine-le-Chateau | 3,386.12 mi (5,449.44 km) |
| South Portland to Braine-le-Comte | 3,382.92 mi (5,444.28 km) |
| South Portland to Brasschaat | 3,379.13 mi (5,438.19 km) |
| South Portland to Brecht | 3,383.41 mi (5,445.07 km) |
| South Portland to Bredene | 3,319.82 mi (5,342.74 km) |
| South Portland to Bree | 3,427.10 mi (5,515.39 km) |
| South Portland to Bruges | 3,330.46 mi (5,359.86 km) |
| South Portland to Brussels | 3,385.29 mi (5,448.10 km) |
| South Portland to Buggenhout | 3,375.13 mi (5,431.75 km) |
| South Portland to Chapelle-lez-Herlaimont | 3,392.53 mi (5,459.75 km) |
| South Portland to Charleroi | 3,400.40 mi (5,472.41 km) |
| South Portland to Chatelet | 3,403.78 mi (5,477.86 km) |
