| Williamsport to Johnstown (Pennsylvania) | 116.98 mi (188.26 km) |
| Williamsport to Joliet (Illinois) | 576.06 mi (927.08 km) |
| Williamsport to Jonesboro (Arkansas) | 825.65 mi (1,328.75 km) |
| Williamsport to Joplin (Missouri) | 976.95 mi (1,572.24 km) |
| Williamsport to Joppatowne (Maryland) | 130.95 mi (210.74 km) |
| Williamsport to Juana Díaz (Puerto Rico) | 1,719.14 mi (2,766.68 km) |
| Williamsport to Junction City (Kansas) | 1,055.40 mi (1,698.50 km) |
| Williamsport to Juneau (Alaska) | 2,706.40 mi (4,355.53 km) |
| Williamsport to Jupiter (Florida) | 1,004.75 mi (1,616.99 km) |
| Williamsport to Jupiter Farms (Florida) | 1,005.67 mi (1,618.47 km) |
| Williamsport to Jurupa Valley (California) | 2,247.41 mi (3,616.85 km) |
| Williamsport to Justice (Illinois) | 559.53 mi (900.48 km) |
| Williamsport to Kahului (Hawaii) | 4,744.27 mi (7,635.16 km) |
| Williamsport to Kailua (Hawaii) | 4,787.80 mi (7,705.22 km) |
| Williamsport to Kalamazoo (Michigan) | 446.31 mi (718.26 km) |
