| South Portland to Germantown (Tennessee) | 1,192.89 mi (1,919.78 km) |
| South Portland to Germantown (Wisconsin) | 893.42 mi (1,437.82 km) |
| South Portland to Gibsonton (Florida) | 1,282.20 mi (2,063.50 km) |
| South Portland to Gig Harbor (Washington) | 2,498.84 mi (4,021.50 km) |
| South Portland to Gilbert (Arizona) | 2,326.20 mi (3,743.66 km) |
| South Portland to Gillette (Wyoming) | 1,738.34 mi (2,797.59 km) |
| South Portland to Gilroy (California) | 2,697.22 mi (4,340.75 km) |
| South Portland to Gladeview (Florida) | 1,350.40 mi (2,173.25 km) |
| South Portland to Gladstone (Missouri) | 1,288.88 mi (2,074.25 km) |
| South Portland to Gladstone (Oregon) | 2,534.06 mi (4,078.17 km) |
| South Portland to Glasgow (Delaware) | 396.05 mi (637.38 km) |
| South Portland to Glasgow (Kentucky) | 940.23 mi (1,513.16 km) |
| South Portland to Glassboro (New Jersey) | 368.18 mi (592.53 km) |
| South Portland to Glassmanor (Maryland) | 480.93 mi (773.98 km) |
| South Portland to Glen Allen (Virginia) | 558.22 mi (898.36 km) |
