| South Portland to Altus (Oklahoma) | 1,663.29 mi (2,676.81 km) |
| South Portland to Alum Rock (California) | 2,697.92 mi (4,341.89 km) |
| South Portland to Alvin (Texas) | 1,690.99 mi (2,721.38 km) |
| South Portland to Amarillo (Texas) | 1,769.05 mi (2,847.00 km) |
| South Portland to Amelia (Ohio) | 788.46 mi (1,268.91 km) |
| South Portland to American Canyon (California) | 2,695.26 mi (4,337.60 km) |
| South Portland to American Fork (Utah) | 2,120.55 mi (3,412.69 km) |
| South Portland to Americus (Georgia) | 1,099.57 mi (1,769.58 km) |
| South Portland to Ames (Iowa) | 1,183.57 mi (1,904.77 km) |
| South Portland to Amherst (Ohio) | 626.69 mi (1,008.56 km) |
| South Portland to Ammon (Idaho) | 2,064.13 mi (3,321.90 km) |
| South Portland to Amsterdam (New York) | 201.88 mi (324.89 km) |
| South Portland to Anacortes (Washington) | 2,482.16 mi (3,994.65 km) |
| South Portland to Anaheim (California) | 2,613.54 mi (4,206.09 km) |
| South Portland to Anchorage (Alaska) | 3,300.67 mi (5,311.92 km) |
