| South Portland to Lovington (New Mexico) | 1,923.13 mi (3,094.98 km) |
| South Portland to Lowell (Indiana) | 886.32 mi (1,426.39 km) |
| South Portland to Lowell (Massachusetts) | 86.06 mi (138.51 km) |
| South Portland to Lower Burrell (Pennsylvania) | 526.64 mi (847.55 km) |
| South Portland to Lowes Island (Virginia) | 483.99 mi (778.90 km) |
| South Portland to Lubbock (Texas) | 1,828.67 mi (2,942.96 km) |
| South Portland to Lufkin (Texas) | 1,577.86 mi (2,539.32 km) |
| South Portland to Luling (Louisiana) | 1,453.52 mi (2,339.21 km) |
| South Portland to Lumberton (North Carolina) | 777.19 mi (1,250.77 km) |
| South Portland to Lumberton (Texas) | 1,602.40 mi (2,578.81 km) |
| South Portland to Lutz (Florida) | 1,265.27 mi (2,036.26 km) |
| South Portland to Lynbrook (New York) | 268.77 mi (432.54 km) |
| South Portland to Lynchburg (Virginia) | 634.88 mi (1,021.74 km) |
| South Portland to Lynden (Washington) | 2,467.70 mi (3,971.37 km) |
| South Portland to Lyndhurst (Ohio) | 587.90 mi (946.13 km) |
