| Houston to Nuth | 5,100.48 mi (8,208.44 km) |
| Houston to Oegstgeest | 5,006.59 mi (8,057.32 km) |
| Houston to Oirschot | 5,059.56 mi (8,142.57 km) |
| Houston to Oisterwijk | 5,053.11 mi (8,132.20 km) |
| Houston to Oldebroek | 5,052.37 mi (8,131.00 km) |
| Houston to Oldenzaal | 5,095.25 mi (8,200.02 km) |
| Houston to Ommen | 5,069.55 mi (8,158.66 km) |
| Houston to Oosterend | 5,041.08 mi (8,112.84 km) |
| Houston to Oosterhout | 5,038.11 mi (8,108.06 km) |
| Houston to Oosterwolde | 5,049.82 mi (8,126.90 km) |
| Houston to Oostzaan | 5,014.68 mi (8,070.35 km) |
| Houston to Opmeer | 5,008.97 mi (8,061.16 km) |
| Houston to Oss | 5,059.44 mi (8,142.39 km) |
| Houston to Oud-Beijerland | 5,015.26 mi (8,071.29 km) |
| Houston to Oudenbosch | 5,027.00 mi (8,090.18 km) |
