| Houston to Oakley (California) | 1,605.09 mi (2,583.15 km) |
| Houston to Oakton (Virginia) | 1,205.06 mi (1,939.35 km) |
| Houston to Oakville (Missouri) | 664.71 mi (1,069.75 km) |
| Houston to Oatfield (Oregon) | 1,824.72 mi (2,936.61 km) |
| Houston to Ocala (Florida) | 796.85 mi (1,282.41 km) |
| Houston to Ocean Acres (New Jersey) | 1,376.43 mi (2,215.14 km) |
| Houston to Ocean City (New Jersey) | 1,347.79 mi (2,169.06 km) |
| Houston to Ocean Pines (Maryland) | 1,297.69 mi (2,088.43 km) |
| Houston to Ocean Pointe (Hawaii) | 3,902.80 mi (6,280.94 km) |
| Houston to Ocean Springs (Mississippi) | 396.95 mi (638.84 km) |
| Houston to Oceanside (California) | 1,310.39 mi (2,108.87 km) |
| Houston to Oceanside (New York) | 1,432.56 mi (2,305.48 km) |
| Houston to Ocoee (Florida) | 839.43 mi (1,350.93 km) |
| Houston to Oconomowoc (Wisconsin) | 995.58 mi (1,602.24 km) |
| Houston to Odenton (Maryland) | 1,239.79 mi (1,995.25 km) |
