| South Portland to Fontana (California) | 2,584.97 mi (4,160.10 km) |
| South Portland to Foothill Farms (California) | 2,635.83 mi (4,241.97 km) |
| South Portland to Fords (New Jersey) | 297.07 mi (478.08 km) |
| South Portland to Forest (Virginia) | 639.78 mi (1,029.63 km) |
| South Portland to Forest Acres (South Carolina) | 876.21 mi (1,410.12 km) |
| South Portland to Forest City (Florida) | 1,204.52 mi (1,938.49 km) |
| South Portland to Forest Grove (Oregon) | 2,555.34 mi (4,112.42 km) |
| South Portland to Forest Hill (Texas) | 1,639.82 mi (2,639.04 km) |
| South Portland to Forest Hills (Michigan) | 764.73 mi (1,230.72 km) |
| South Portland to Forest Lake (Minnesota) | 1,120.12 mi (1,802.65 km) |
| South Portland to Forest Park (Georgia) | 1,024.55 mi (1,648.85 km) |
| South Portland to Forest Park (Illinois) | 895.82 mi (1,441.68 km) |
| South Portland to Forest Park (Ohio) | 794.63 mi (1,278.84 km) |
| South Portland to Forestville (Maryland) | 475.05 mi (764.52 km) |
| South Portland to Forestville (Ohio) | 792.57 mi (1,275.51 km) |
