| Martinsburg to Johnstown (Pennsylvania) | 78.02 mi (125.57 km) |
| Martinsburg to Joliet (Illinois) | 552.79 mi (889.64 km) |
| Martinsburg to Jonesboro (Arkansas) | 738.17 mi (1,187.96 km) |
| Martinsburg to Joplin (Missouri) | 910.03 mi (1,464.55 km) |
| Martinsburg to Joppatowne (Maryland) | 86.81 mi (139.71 km) |
| Martinsburg to Juana Díaz (Puerto Rico) | 1,630.67 mi (2,624.32 km) |
| Martinsburg to Junction City (Kansas) | 1,008.51 mi (1,623.04 km) |
| Martinsburg to Juneau (Alaska) | 2,761.96 mi (4,444.94 km) |
| Martinsburg to Jupiter (Florida) | 874.98 mi (1,408.14 km) |
| Martinsburg to Jupiter Farms (Florida) | 875.71 mi (1,409.31 km) |
| Martinsburg to Jurupa Valley (California) | 2,201.33 mi (3,542.70 km) |
| Martinsburg to Justice (Illinois) | 540.40 mi (869.69 km) |
| Martinsburg to Kahului (Hawaii) | 4,716.03 mi (7,589.72 km) |
| Martinsburg to Kailua (Hawaii) | 4,762.31 mi (7,664.20 km) |
| Martinsburg to Kalamazoo (Michigan) | 442.50 mi (712.13 km) |
