| South Portland to Glen Burnie (Maryland) | 450.11 mi (724.38 km) |
| South Portland to Glen Carbon (Illinois) | 1,074.73 mi (1,729.61 km) |
| South Portland to Glen Cove (New York) | 255.95 mi (411.91 km) |
| South Portland to Glen Ellyn (Illinois) | 908.20 mi (1,461.61 km) |
| South Portland to Glen Rock (New Jersey) | 269.16 mi (433.18 km) |
| South Portland to Glendale (Arizona) | 2,341.11 mi (3,767.66 km) |
| South Portland to Glendale (California) | 2,621.44 mi (4,218.80 km) |
| South Portland to Glendale (Wisconsin) | 884.77 mi (1,423.90 km) |
| South Portland to Glendale Heights (Illinois) | 908.12 mi (1,461.48 km) |
| South Portland to Glendora (California) | 2,602.68 mi (4,188.61 km) |
| South Portland to Glenmont (Maryland) | 471.04 mi (758.06 km) |
| South Portland to Glenn Dale (Maryland) | 466.03 mi (750.00 km) |
| South Portland to Glenn Heights (Texas) | 1,624.81 mi (2,614.89 km) |
| South Portland to Glenpool (Oklahoma) | 1,457.45 mi (2,345.54 km) |
| South Portland to Glens Falls (New York) | 169.73 mi (273.15 km) |
