| South Portland to Beacon (New York) | 237.86 mi (382.80 km) |
| South Portland to Bear (Delaware) | 392.74 mi (632.06 km) |
| South Portland to Beatrice (Nebraska) | 1,373.05 mi (2,209.71 km) |
| South Portland to Beaufort (South Carolina) | 956.48 mi (1,539.31 km) |
| South Portland to Beaumont (California) | 2,567.18 mi (4,131.48 km) |
| South Portland to Beaumont (Texas) | 1,607.57 mi (2,587.14 km) |
| South Portland to Beaver Dam (Wisconsin) | 926.63 mi (1,491.27 km) |
| South Portland to Beavercreek (Ohio) | 758.95 mi (1,221.41 km) |
| South Portland to Beaverton (Oregon) | 2,542.65 mi (4,092.00 km) |
| South Portland to Beckley (West Virginia) | 698.04 mi (1,123.38 km) |
| South Portland to Bedford (Indiana) | 901.96 mi (1,451.57 km) |
| South Portland to Bedford (Ohio) | 592.80 mi (954.01 km) |
| South Portland to Bedford (Texas) | 1,626.24 mi (2,617.19 km) |
| South Portland to Bedford Heights (Ohio) | 591.02 mi (951.15 km) |
| South Portland to Beech Grove (Indiana) | 857.41 mi (1,379.87 km) |
