| Hardenberg to Octeville | 411.60 mi (662.41 km) |
| Hardenberg to Oignies | 212.72 mi (342.33 km) |
| Hardenberg to Oissel | 327.67 mi (527.33 km) |
| Hardenberg to Olivet | 385.89 mi (621.04 km) |
| Hardenberg to Ollioules | 652.33 mi (1,049.82 km) |
| Hardenberg to Olonne-sur-Mer | 560.56 mi (902.13 km) |
| Hardenberg to Oloron-Sainte-Marie | 728.11 mi (1,171.79 km) |
| Hardenberg to Onet Village | 595.62 mi (958.56 km) |
| Hardenberg to Onnaing | 198.81 mi (319.95 km) |
| Hardenberg to Orange | 588.18 mi (946.58 km) |
| Hardenberg to Orchies | 204.69 mi (329.42 km) |
| Hardenberg to Orleans | 383.41 mi (617.03 km) |
| Hardenberg to Orly | 322.37 mi (518.80 km) |
| Hardenberg to Ormesson-sur-Marne | 316.32 mi (509.07 km) |
| Hardenberg to Orsay | 330.21 mi (531.42 km) |
