| Pikesville to Octeville | 3,608.57 mi (5,807.43 km) |
| Pikesville to Oignies | 3,781.44 mi (6,085.64 km) |
| Pikesville to Oissel | 3,730.61 mi (6,003.84 km) |
| Pikesville to Olivet | 3,802.71 mi (6,119.88 km) |
| Pikesville to Ollioules | 4,113.31 mi (6,619.73 km) |
| Pikesville to Olonne-sur-Mer | 3,676.76 mi (5,917.18 km) |
| Pikesville to Oloron-Sainte-Marie | 3,818.57 mi (6,145.39 km) |
| Pikesville to Onet Village | 3,930.25 mi (6,325.12 km) |
| Pikesville to Onnaing | 3,808.25 mi (6,128.79 km) |
| Pikesville to Orange | 4,035.95 mi (6,495.24 km) |
| Pikesville to Orchies | 3,791.56 mi (6,101.92 km) |
| Pikesville to Orleans | 3,802.06 mi (6,118.82 km) |
| Pikesville to Orly | 3,800.61 mi (6,116.48 km) |
| Pikesville to Ormesson-sur-Marne | 3,805.65 mi (6,124.60 km) |
| Pikesville to Orsay | 3,793.12 mi (6,104.44 km) |
