| South Portland to Austin (Minnesota) | 1,130.72 mi (1,819.72 km) |
| South Portland to Austin (Texas) | 1,761.43 mi (2,834.74 km) |
| South Portland to Austintown (Ohio) | 561.17 mi (903.11 km) |
| South Portland to Avenal (California) | 2,654.53 mi (4,272.06 km) |
| South Portland to Avenel (New Jersey) | 293.15 mi (471.79 km) |
| South Portland to Aventura (Florida) | 1,340.58 mi (2,157.45 km) |
| South Portland to Avocado Heights (California) | 2,613.75 mi (4,206.43 km) |
| South Portland to Avon (Indiana) | 871.05 mi (1,401.83 km) |
| South Portland to Avon (Ohio) | 615.28 mi (990.19 km) |
| South Portland to Avon Lake (Ohio) | 614.16 mi (988.40 km) |
| South Portland to Avondale (Arizona) | 2,352.34 mi (3,785.73 km) |
| South Portland to Azalea Park (Florida) | 1,207.35 mi (1,943.04 km) |
| South Portland to Azle (Texas) | 1,643.48 mi (2,644.92 km) |
| South Portland to Azusa (California) | 2,606.18 mi (4,194.24 km) |
| South Portland to Bacliff (Texas) | 1,671.79 mi (2,690.48 km) |
