| South Portland to Greenfield (California) | 2,701.29 mi (4,347.31 km) |
| South Portland to Greenfield (Indiana) | 840.00 mi (1,351.85 km) |
| South Portland to Greenfield (Wisconsin) | 890.38 mi (1,432.93 km) |
| South Portland to Greenlawn (New York) | 247.57 mi (398.42 km) |
| South Portland to Greensboro (North Carolina) | 724.94 mi (1,166.68 km) |
| South Portland to Greensburg (Indiana) | 839.51 mi (1,351.07 km) |
| South Portland to Greensburg (Pennsylvania) | 527.45 mi (848.85 km) |
| South Portland to Greentree (New Jersey) | 352.67 mi (567.57 km) |
| South Portland to Greenville (Mississippi) | 1,321.40 mi (2,126.59 km) |
| South Portland to Greenville (North Carolina) | 670.69 mi (1,079.38 km) |
| South Portland to Greenville (Ohio) | 775.42 mi (1,247.91 km) |
| South Portland to Greenville (South Carolina) | 885.36 mi (1,424.85 km) |
| South Portland to Greenville (Texas) | 1,567.10 mi (2,522.00 km) |
| South Portland to Greenwood (Indiana) | 861.56 mi (1,386.55 km) |
| South Portland to Greenwood (Mississippi) | 1,277.56 mi (2,056.04 km) |
