| Cincinnati to Octeville | 3,944.53 mi (6,348.11 km) |
| Cincinnati to Oignies | 4,107.10 mi (6,609.75 km) |
| Cincinnati to Oissel | 4,064.42 mi (6,541.04 km) |
| Cincinnati to Olivet | 4,142.37 mi (6,666.49 km) |
| Cincinnati to Ollioules | 4,466.92 mi (7,188.82 km) |
| Cincinnati to Olonne-sur-Mer | 4,027.35 mi (6,481.39 km) |
| Cincinnati to Oloron-Sainte-Marie | 4,181.36 mi (6,729.25 km) |
| Cincinnati to Onet Village | 4,283.94 mi (6,894.33 km) |
| Cincinnati to Onnaing | 4,133.48 mi (6,652.19 km) |
| Cincinnati to Orange | 4,387.26 mi (7,060.61 km) |
| Cincinnati to Orchies | 4,116.85 mi (6,625.43 km) |
| Cincinnati to Orleans | 4,141.52 mi (6,665.13 km) |
| Cincinnati to Orly | 4,135.48 mi (6,655.41 km) |
| Cincinnati to Ormesson-sur-Marne | 4,140.12 mi (6,662.88 km) |
| Cincinnati to Orsay | 4,128.50 mi (6,644.18 km) |
