| Harlau to Octeville | 1,307.40 mi (2,104.06 km) |
| Harlau to Oignies | 1,100.41 mi (1,770.93 km) |
| Harlau to Oissel | 1,186.27 mi (1,909.12 km) |
| Harlau to Olivet | 1,159.52 mi (1,866.07 km) |
| Harlau to Ollioules | 1,062.29 mi (1,709.58 km) |
| Harlau to Olonne-sur-Mer | 1,345.83 mi (2,165.90 km) |
| Harlau to Oloron-Sainte-Marie | 1,361.12 mi (2,190.51 km) |
| Harlau to Onet Village | 1,183.26 mi (1,904.28 km) |
| Harlau to Onnaing | 1,073.63 mi (1,727.85 km) |
| Harlau to Orange | 1,085.00 mi (1,746.14 km) |
| Harlau to Orchies | 1,089.40 mi (1,753.23 km) |
| Harlau to Orleans | 1,158.77 mi (1,864.86 km) |
| Harlau to Orly | 1,130.40 mi (1,819.20 km) |
| Harlau to Ormesson-sur-Marne | 1,123.56 mi (1,808.20 km) |
| Harlau to Orsay | 1,139.99 mi (1,834.63 km) |
