| Barreiro to Octeville | 840.98 mi (1,353.43 km) |
| Barreiro to Oignies | 1,005.93 mi (1,618.88 km) |
| Barreiro to Oissel | 892.06 mi (1,435.62 km) |
| Barreiro to Olivet | 839.92 mi (1,351.72 km) |
| Barreiro to Ollioules | 836.41 mi (1,346.07 km) |
| Barreiro to Olonne-sur-Mer | 657.56 mi (1,058.25 km) |
| Barreiro to Oloron-Sainte-Marie | 540.74 mi (870.23 km) |
| Barreiro to Onet Village | 719.30 mi (1,157.60 km) |
| Barreiro to Onnaing | 1,019.29 mi (1,640.38 km) |
| Barreiro to Orange | 810.98 mi (1,305.14 km) |
| Barreiro to Orchies | 1,013.41 mi (1,630.93 km) |
| Barreiro to Orleans | 842.08 mi (1,355.20 km) |
| Barreiro to Orly | 899.29 mi (1,447.26 km) |
| Barreiro to Ormesson-sur-Marne | 905.96 mi (1,458.00 km) |
| Barreiro to Orsay | 890.56 mi (1,433.22 km) |
