| South Portland to Groveton (Virginia) | 488.09 mi (785.50 km) |
| South Portland to Grovetown (Georgia) | 951.77 mi (1,531.72 km) |
| South Portland to Guayama (Puerto Rico) | 1,789.37 mi (2,879.71 km) |
| South Portland to Guaynabo (Puerto Rico) | 1,761.30 mi (2,834.54 km) |
| South Portland to Gulf Shores (Alabama) | 1,327.32 mi (2,136.11 km) |
| South Portland to Gulfport (Florida) | 1,296.83 mi (2,087.04 km) |
| South Portland to Gulfport (Mississippi) | 1,374.41 mi (2,211.91 km) |
| South Portland to Gunbarrel (Colorado) | 1,798.76 mi (2,894.82 km) |
| South Portland to Gurnee (Illinois) | 894.39 mi (1,439.38 km) |
| South Portland to Guthrie (Oklahoma) | 1,531.06 mi (2,464.00 km) |
| South Portland to Guttenberg (New Jersey) | 273.09 mi (439.49 km) |
| South Portland to Guymon (Oklahoma) | 1,703.94 mi (2,742.23 km) |
| South Portland to Hacienda Heights (California) | 2,613.96 mi (4,206.76 km) |
| South Portland to Hackensack (New Jersey) | 269.75 mi (434.11 km) |
| South Portland to Hackettstown (New Jersey) | 301.00 mi (484.42 km) |
