| Barstow to Octeville | 5,390.90 mi (8,675.82 km) |
| Barstow to Oignies | 5,504.04 mi (8,857.90 km) |
| Barstow to Oissel | 5,495.66 mi (8,844.41 km) |
| Barstow to Olivet | 5,592.34 mi (9,000.00 km) |
| Barstow to Ollioules | 5,957.97 mi (9,588.42 km) |
| Barstow to Olonne-sur-Mer | 5,526.30 mi (8,893.72 km) |
| Barstow to Oloron-Sainte-Marie | 5,722.49 mi (9,209.45 km) |
| Barstow to Onet Village | 5,783.51 mi (9,307.65 km) |
| Barstow to Onnaing | 5,527.09 mi (8,894.99 km) |
| Barstow to Orange | 5,872.30 mi (9,450.55 km) |
| Barstow to Orchies | 5,511.72 mi (8,870.26 km) |
| Barstow to Orleans | 5,590.79 mi (8,997.51 km) |
| Barstow to Orly | 5,566.92 mi (8,959.09 km) |
| Barstow to Ormesson-sur-Marne | 5,569.72 mi (8,963.60 km) |
| Barstow to Orsay | 5,562.31 mi (8,951.68 km) |
