| South Houston to Octeville | 4,837.41 mi (7,785.06 km) |
| South Houston to Oignies | 5,001.46 mi (8,049.07 km) |
| South Houston to Oissel | 4,957.76 mi (7,978.74 km) |
| South Houston to Olivet | 5,034.50 mi (8,102.25 km) |
| South Houston to Ollioules | 5,354.19 mi (8,616.74 km) |
| South Houston to Olonne-sur-Mer | 4,915.75 mi (7,911.14 km) |
| South Houston to Oloron-Sainte-Marie | 5,063.23 mi (8,148.48 km) |
| South Houston to Onet Village | 5,171.08 mi (8,322.04 km) |
| South Houston to Onnaing | 5,027.87 mi (8,091.57 km) |
| South Houston to Orange | 5,275.55 mi (8,490.18 km) |
| South Houston to Orchies | 5,011.23 mi (8,064.80 km) |
| South Houston to Orleans | 5,033.70 mi (8,100.96 km) |
| South Houston to Orly | 5,028.66 mi (8,092.84 km) |
| South Houston to Ormesson-sur-Marne | 5,033.37 mi (8,100.43 km) |
| South Houston to Orsay | 5,021.58 mi (8,081.45 km) |
