| South Portland to Bixby (Oklahoma) | 1,451.34 mi (2,335.70 km) |
| South Portland to Black Forest (Colorado) | 1,798.08 mi (2,893.73 km) |
| South Portland to Blackfoot (Idaho) | 2,088.08 mi (3,360.44 km) |
| South Portland to Blackhawk (California) | 2,688.68 mi (4,327.01 km) |
| South Portland to Blacksburg (Virginia) | 691.85 mi (1,113.43 km) |
| South Portland to Blackwells Mills (New Jersey) | 310.28 mi (499.35 km) |
| South Portland to Blaine (Minnesota) | 1,132.51 mi (1,822.59 km) |
| South Portland to Bloomingdale (Florida) | 1,275.72 mi (2,053.07 km) |
| South Portland to Bloomingdale (Illinois) | 908.19 mi (1,461.59 km) |
| South Portland to Bloomington (California) | 2,583.27 mi (4,157.37 km) |
| South Portland to Bloomington (Illinois) | 980.60 mi (1,578.12 km) |
| South Portland to Bloomington (Indiana) | 894.51 mi (1,439.58 km) |
| South Portland to Bloomington (Minnesota) | 1,139.13 mi (1,833.25 km) |
| South Portland to Bloomsburg (Pennsylvania) | 363.50 mi (584.99 km) |
| South Portland to Blue Ash (Ohio) | 789.00 mi (1,269.78 km) |
