| Rancho San Diego to Octeville | 5,503.17 mi (8,856.50 km) |
| Rancho San Diego to Oignies | 5,620.47 mi (9,045.27 km) |
| Rancho San Diego to Oissel | 5,609.47 mi (9,027.57 km) |
| Rancho San Diego to Olivet | 5,704.97 mi (9,181.26 km) |
| Rancho San Diego to Ollioules | 6,068.20 mi (9,765.83 km) |
| Rancho San Diego to Olonne-sur-Mer | 5,634.50 mi (9,067.85 km) |
| Rancho San Diego to Oloron-Sainte-Marie | 5,827.22 mi (9,378.01 km) |
| Rancho San Diego to Onet Village | 5,892.45 mi (9,482.97 km) |
| Rancho San Diego to Onnaing | 5,643.83 mi (9,082.87 km) |
| Rancho San Diego to Orange | 5,982.82 mi (9,628.41 km) |
| Rancho San Diego to Orchies | 5,628.33 mi (9,057.91 km) |
| Rancho San Diego to Orleans | 5,703.48 mi (9,178.86 km) |
| Rancho San Diego to Orly | 5,680.95 mi (9,142.61 km) |
| Rancho San Diego to Ormesson-sur-Marne | 5,683.90 mi (9,147.36 km) |
| Rancho San Diego to Orsay | 5,676.14 mi (9,134.87 km) |
