| National City to Oak Harbor (Washington) | 1,117.72 mi (1,798.80 km) |
| National City to Oak Hills (Oregon) | 940.72 mi (1,513.94 km) |
| National City to Oak Lawn (Illinois) | 1,721.61 mi (2,770.66 km) |
| National City to Oak Park (California) | 142.41 mi (229.19 km) |
| National City to Oak Park (Illinois) | 1,722.21 mi (2,771.62 km) |
| National City to Oak Park (Michigan) | 1,961.42 mi (3,156.60 km) |
| National City to Oak Ridge (Florida) | 2,132.37 mi (3,431.72 km) |
| National City to Oak Ridge (New Jersey) | 2,400.20 mi (3,862.75 km) |
| National City to Oak Ridge (Tennessee) | 1,877.05 mi (3,020.81 km) |
| National City to Oakdale (California) | 410.72 mi (660.99 km) |
| National City to Oakdale (Minnesota) | 1,543.81 mi (2,484.52 km) |
| National City to Oakland (California) | 456.82 mi (735.17 km) |
| National City to Oakland (New Jersey) | 2,413.56 mi (3,884.25 km) |
| National City to Oakland Park (Florida) | 2,256.49 mi (3,631.48 km) |
| National City to Oakleaf Plantation (Florida) | 2,077.00 mi (3,342.61 km) |
