| South Portland to Jeffersontown (Kentucky) | 879.70 mi (1,415.74 km) |
| South Portland to Jeffersonville (Indiana) | 881.40 mi (1,418.47 km) |
| South Portland to Jenison (Michigan) | 782.14 mi (1,258.74 km) |
| South Portland to Jenks (Oklahoma) | 1,454.25 mi (2,340.38 km) |
| South Portland to Jennings (Missouri) | 1,089.56 mi (1,753.48 km) |
| South Portland to Jensen Beach (Florida) | 1,261.04 mi (2,029.45 km) |
| South Portland to Jericho (New York) | 257.44 mi (414.31 km) |
| South Portland to Jerome (Idaho) | 2,202.65 mi (3,544.83 km) |
| South Portland to Jersey City (New Jersey) | 279.12 mi (449.21 km) |
| South Portland to Jessup (Maryland) | 456.90 mi (735.31 km) |
| South Portland to Johns Creek (Georgia) | 997.78 mi (1,605.77 km) |
| South Portland to Johnson City (New York) | 305.47 mi (491.60 km) |
| South Portland to Johnson City (Tennessee) | 813.08 mi (1,308.53 km) |
| South Portland to Johnston (Iowa) | 1,194.17 mi (1,921.83 km) |
| South Portland to Johnstown (Colorado) | 1,781.14 mi (2,866.47 km) |
