| South Portland to Ashtabula (Ohio) | 546.28 mi (879.15 km) |
| South Portland to Ashwaubenon (Wisconsin) | 884.02 mi (1,422.70 km) |
| South Portland to Aspen Hill (Maryland) | 471.32 mi (758.52 km) |
| South Portland to Astoria (Oregon) | 2,574.66 mi (4,143.51 km) |
| South Portland to Atascadero (California) | 2,700.35 mi (4,345.79 km) |
| South Portland to Atascocita (Texas) | 1,659.32 mi (2,670.41 km) |
| South Portland to Atchison (Kansas) | 1,309.02 mi (2,106.66 km) |
| South Portland to Athens (Alabama) | 1,078.08 mi (1,735.00 km) |
| South Portland to Athens (Georgia) | 969.11 mi (1,559.63 km) |
| South Portland to Athens (Ohio) | 678.93 mi (1,092.64 km) |
| South Portland to Athens (Tennessee) | 946.80 mi (1,523.72 km) |
| South Portland to Athens (Texas) | 1,591.01 mi (2,560.48 km) |
| South Portland to Atlanta (Georgia) | 1,019.96 mi (1,641.46 km) |
| South Portland to Atlantic Beach (Florida) | 1,102.50 mi (1,774.30 km) |
| South Portland to Atlantic City (New Jersey) | 364.15 mi (586.04 km) |
