| Piatra Neamt to Octeville | 1,293.91 mi (2,082.34 km) |
| Piatra Neamt to Oignies | 1,088.90 mi (1,752.41 km) |
| Piatra Neamt to Oissel | 1,171.92 mi (1,886.02 km) |
| Piatra Neamt to Olivet | 1,141.54 mi (1,837.13 km) |
| Piatra Neamt to Ollioules | 1,032.43 mi (1,661.54 km) |
| Piatra Neamt to Olonne-sur-Mer | 1,325.90 mi (2,133.83 km) |
| Piatra Neamt to Oloron-Sainte-Marie | 1,334.69 mi (2,147.98 km) |
| Piatra Neamt to Onet Village | 1,157.46 mi (1,862.75 km) |
| Piatra Neamt to Onnaing | 1,061.96 mi (1,709.06 km) |
| Piatra Neamt to Orange | 1,057.68 mi (1,702.17 km) |
| Piatra Neamt to Orchies | 1,077.93 mi (1,734.76 km) |
| Piatra Neamt to Orleans | 1,140.88 mi (1,836.07 km) |
| Piatra Neamt to Orly | 1,114.47 mi (1,793.57 km) |
| Piatra Neamt to Ormesson-sur-Marne | 1,107.72 mi (1,782.71 km) |
| Piatra Neamt to Orsay | 1,123.97 mi (1,808.85 km) |
