| Houston to Oak Harbor (Washington) | 1,923.94 mi (3,096.28 km) |
| Houston to Oak Hills (Oregon) | 1,839.40 mi (2,960.24 km) |
| Houston to Oak Lawn (Illinois) | 927.76 mi (1,493.09 km) |
| Houston to Oak Park (California) | 1,400.02 mi (2,253.12 km) |
| Houston to Oak Park (Illinois) | 937.24 mi (1,508.34 km) |
| Houston to Oak Park (Michigan) | 1,107.21 mi (1,781.88 km) |
| Houston to Oak Ridge (Florida) | 847.59 mi (1,364.06 km) |
| Houston to Oak Ridge (New Jersey) | 1,404.09 mi (2,259.66 km) |
| Houston to Oak Ridge (Tennessee) | 771.62 mi (1,241.81 km) |
| Houston to Oakdale (California) | 1,556.42 mi (2,504.82 km) |
| Houston to Oakdale (Minnesota) | 1,058.59 mi (1,703.64 km) |
| Houston to Oakland (California) | 1,629.89 mi (2,623.05 km) |
| Houston to Oakland (New Jersey) | 1,415.98 mi (2,278.81 km) |
| Houston to Oakland Park (Florida) | 961.61 mi (1,547.55 km) |
| Houston to Oakleaf Plantation (Florida) | 811.21 mi (1,305.52 km) |
