| National City to Johnstown (Pennsylvania) | 2,167.75 mi (3,488.65 km) |
| National City to Joliet (Illinois) | 1,698.79 mi (2,733.94 km) |
| National City to Jonesboro (Arkansas) | 1,519.94 mi (2,446.11 km) |
| National City to Joplin (Missouri) | 1,313.26 mi (2,113.48 km) |
| National City to Joppatowne (Maryland) | 2,303.59 mi (3,707.28 km) |
| National City to Juana Díaz (Puerto Rico) | 3,283.16 mi (5,283.73 km) |
| National City to Junction City (Kansas) | 1,212.91 mi (1,951.99 km) |
| National City to Juneau (Alaska) | 1,951.09 mi (3,139.97 km) |
| National City to Jupiter (Florida) | 2,241.46 mi (3,607.28 km) |
| National City to Jupiter Farms (Florida) | 2,235.24 mi (3,597.27 km) |
| National City to Jurupa Valley (California) | 94.75 mi (152.49 km) |
| National City to Justice (Illinois) | 1,717.99 mi (2,764.83 km) |
| National City to Kahului (Hawaii) | 2,544.47 mi (4,094.93 km) |
| National City to Kailua (Hawaii) | 2,602.09 mi (4,187.66 km) |
| National City to Kalamazoo (Michigan) | 1,838.18 mi (2,958.26 km) |
