| Northport to Johnstown (Pennsylvania) | 684.22 mi (1,101.15 km) |
| Northport to Joliet (Illinois) | 571.52 mi (919.77 km) |
| Northport to Jonesboro (Arkansas) | 249.12 mi (400.92 km) |
| Northport to Joplin (Missouri) | 470.48 mi (757.17 km) |
| Northport to Joppatowne (Maryland) | 756.03 mi (1,216.71 km) |
| Northport to Juana Díaz (Puerto Rico) | 1,675.99 mi (2,697.24 km) |
| Northport to Junction City (Kansas) | 651.58 mi (1,048.62 km) |
| Northport to Juneau (Alaska) | 2,751.02 mi (4,427.34 km) |
| Northport to Jupiter (Florida) | 625.81 mi (1,007.14 km) |
| Northport to Jupiter Farms (Florida) | 621.19 mi (999.71 km) |
| Northport to Jurupa Valley (California) | 1,713.14 mi (2,757.03 km) |
| Northport to Justice (Illinois) | 586.81 mi (944.37 km) |
| Northport to Kahului (Hawaii) | 4,249.23 mi (6,838.47 km) |
| Northport to Kailua (Hawaii) | 4,305.88 mi (6,929.64 km) |
| Northport to Kalamazoo (Michigan) | 632.52 mi (1,017.94 km) |
