| Mackworth to Joliet (Illinois) | 3,886.58 mi (6,254.84 km) |
| Mackworth to Jonesboro (Arkansas) | 4,262.18 mi (6,859.31 km) |
| Mackworth to Joplin (Missouri) | 4,343.32 mi (6,989.89 km) |
| Mackworth to Joppatowne (Maryland) | 3,527.32 mi (5,676.68 km) |
| Mackworth to Juana Díaz (Puerto Rico) | 4,192.15 mi (6,746.62 km) |
| Mackworth to Junction City (Kansas) | 4,330.36 mi (6,969.03 km) |
| Mackworth to Juneau (Alaska) | 4,297.78 mi (6,916.60 km) |
| Mackworth to Jupiter (Florida) | 4,291.72 mi (6,906.85 km) |
| Mackworth to Jupiter Farms (Florida) | 4,295.97 mi (6,913.70 km) |
| Mackworth to Jurupa Valley (California) | 5,309.33 mi (8,544.54 km) |
| Mackworth to Justice (Illinois) | 3,863.79 mi (6,218.17 km) |
| Mackworth to Kahului (Hawaii) | 7,120.51 mi (11,459.35 km) |
| Mackworth to Kailua (Hawaii) | 7,106.84 mi (11,437.36 km) |
| Mackworth to Kalamazoo (Michigan) | 3,754.64 mi (6,042.51 km) |
| Mackworth to Kalispell (Montana) | 4,417.68 mi (7,109.57 km) |
