| Decatur to Octeville | 4,091.75 mi (6,585.04 km) |
| Decatur to Oignies | 4,246.15 mi (6,833.52 km) |
| Decatur to Oissel | 4,209.59 mi (6,774.67 km) |
| Decatur to Olivet | 4,291.61 mi (6,906.68 km) |
| Decatur to Ollioules | 4,625.89 mi (7,444.64 km) |
| Decatur to Olonne-sur-Mer | 4,185.30 mi (6,735.59 km) |
| Decatur to Oloron-Sainte-Marie | 4,348.47 mi (6,998.18 km) |
| Decatur to Onet Village | 4,443.50 mi (7,151.12 km) |
| Decatur to Onnaing | 4,272.10 mi (6,875.28 km) |
| Decatur to Orange | 4,544.64 mi (7,313.89 km) |
| Decatur to Orchies | 4,255.58 mi (6,848.70 km) |
| Decatur to Orleans | 4,290.63 mi (6,905.09 km) |
| Decatur to Orly | 4,281.18 mi (6,889.89 km) |
| Decatur to Ormesson-sur-Marne | 4,285.51 mi (6,896.85 km) |
| Decatur to Orsay | 4,274.60 mi (6,879.30 km) |
