| Gaithersburg to Oak Harbor (Washington) | 2,318.01 mi (3,730.47 km) |
| Gaithersburg to Oak Hills (Oregon) | 2,339.52 mi (3,765.09 km) |
| Gaithersburg to Oak Lawn (Illinois) | 581.86 mi (936.41 km) |
| Gaithersburg to Oak Park (California) | 2,308.14 mi (3,714.60 km) |
| Gaithersburg to Oak Park (Illinois) | 586.78 mi (944.33 km) |
| Gaithersburg to Oak Park (Michigan) | 387.68 mi (623.92 km) |
| Gaithersburg to Oak Ridge (Florida) | 774.94 mi (1,247.14 km) |
| Gaithersburg to Oak Ridge (New Jersey) | 194.42 mi (312.89 km) |
| Gaithersburg to Oak Ridge (Tennessee) | 445.27 mi (716.59 km) |
| Gaithersburg to Oakdale (California) | 2,340.06 mi (3,765.96 km) |
| Gaithersburg to Oakdale (Minnesota) | 901.42 mi (1,450.70 km) |
| Gaithersburg to Oakland (California) | 2,411.29 mi (3,880.59 km) |
| Gaithersburg to Oakland (New Jersey) | 204.58 mi (329.24 km) |
| Gaithersburg to Oakland Park (Florida) | 911.25 mi (1,466.51 km) |
| Gaithersburg to Oakleaf Plantation (Florida) | 672.58 mi (1,082.41 km) |
