| South Portland to Lombard (Illinois) | 905.72 mi (1,457.61 km) |
| South Portland to Lomita (California) | 2,638.10 mi (4,245.60 km) |
| South Portland to Lompoc (California) | 2,716.50 mi (4,371.78 km) |
| South Portland to London (Ohio) | 724.16 mi (1,165.42 km) |
| South Portland to Lone Tree (Colorado) | 1,796.29 mi (2,890.85 km) |
| South Portland to Long Beach (California) | 2,630.42 mi (4,233.26 km) |
| South Portland to Long Beach (Mississippi) | 1,381.63 mi (2,223.52 km) |
| South Portland to Long Beach (New York) | 272.23 mi (438.12 km) |
| South Portland to Long Branch (New Jersey) | 298.69 mi (480.69 km) |
| South Portland to Longmont (Colorado) | 1,792.82 mi (2,885.26 km) |
| South Portland to Longview (Texas) | 1,528.08 mi (2,459.21 km) |
| South Portland to Longview (Washington) | 2,536.63 mi (4,082.31 km) |
| South Portland to Longwood (Florida) | 1,199.40 mi (1,930.25 km) |
| South Portland to Lorain (Ohio) | 623.58 mi (1,003.55 km) |
| South Portland to Lorton (Virginia) | 495.62 mi (797.63 km) |
