| South Portland to Gonzales (Louisiana) | 1,461.97 mi (2,352.81 km) |
| South Portland to Gonzalez (Florida) | 1,295.29 mi (2,084.56 km) |
| South Portland to Goodlettsville (Tennessee) | 1,002.01 mi (1,612.57 km) |
| South Portland to Goodyear (Arizona) | 2,358.64 mi (3,795.86 km) |
| South Portland to Goose Creek (South Carolina) | 902.88 mi (1,453.04 km) |
| South Portland to Goshen (Indiana) | 801.82 mi (1,290.41 km) |
| South Portland to Goulds (Florida) | 1,371.74 mi (2,207.60 km) |
| South Portland to Grafton (Wisconsin) | 883.96 mi (1,422.60 km) |
| South Portland to Graham (North Carolina) | 710.99 mi (1,144.22 km) |
| South Portland to Graham (Washington) | 2,489.64 mi (4,006.69 km) |
| South Portland to Grain Valley (Missouri) | 1,276.47 mi (2,054.29 km) |
| South Portland to Granbury (Texas) | 1,672.33 mi (2,691.35 km) |
| South Portland to Grand Forks (North Dakota) | 1,317.85 mi (2,120.87 km) |
| South Portland to Grand Haven (Michigan) | 800.25 mi (1,287.87 km) |
| South Portland to Grand Island (Nebraska) | 1,440.15 mi (2,317.69 km) |
