| South Houston to Nuth | 5,100.90 mi (8,209.11 km) |
| South Houston to Oegstgeest | 5,007.18 mi (8,058.28 km) |
| South Houston to Oirschot | 5,060.06 mi (8,143.38 km) |
| South Houston to Oisterwijk | 5,053.63 mi (8,133.03 km) |
| South Houston to Oldebroek | 5,053.11 mi (8,132.19 km) |
| South Houston to Oldenzaal | 5,096.03 mi (8,201.28 km) |
| South Houston to Ommen | 5,070.34 mi (8,159.93 km) |
| South Houston to Oosterend | 5,041.95 mi (8,114.24 km) |
| South Houston to Oosterhout | 5,038.62 mi (8,108.87 km) |
| South Houston to Oosterwolde | 5,050.70 mi (8,128.32 km) |
| South Houston to Oostzaan | 5,015.35 mi (8,071.43 km) |
| South Houston to Opmeer | 5,009.71 mi (8,062.34 km) |
| South Houston to Oss | 5,060.02 mi (8,143.31 km) |
| South Houston to Oud-Beijerland | 5,015.77 mi (8,072.11 km) |
| South Houston to Oudenbosch | 5,027.47 mi (8,090.94 km) |
