| Williamstown to Johnstown (Pennsylvania) | 213.16 mi (343.04 km) |
| Williamstown to Joliet (Illinois) | 701.70 mi (1,129.28 km) |
| Williamstown to Jonesboro (Arkansas) | 896.93 mi (1,443.46 km) |
| Williamstown to Joplin (Missouri) | 1,070.48 mi (1,722.77 km) |
| Williamstown to Joppatowne (Maryland) | 75.47 mi (121.46 km) |
| Williamstown to Juana Díaz (Puerto Rico) | 1,578.33 mi (2,540.08 km) |
| Williamstown to Junction City (Kansas) | 1,166.48 mi (1,877.26 km) |
| Williamstown to Juneau (Alaska) | 2,858.68 mi (4,600.60 km) |
| Williamstown to Jupiter (Florida) | 930.17 mi (1,496.97 km) |
| Williamstown to Jupiter Farms (Florida) | 931.98 mi (1,499.87 km) |
| Williamstown to Jurupa Valley (California) | 2,359.82 mi (3,797.77 km) |
| Williamstown to Justice (Illinois) | 687.44 mi (1,106.33 km) |
| Williamstown to Kahului (Hawaii) | 4,870.16 mi (7,837.77 km) |
| Williamstown to Kailua (Hawaii) | 4,915.47 mi (7,910.69 km) |
| Williamstown to Kalamazoo (Michigan) | 581.09 mi (935.18 km) |
