| Harlau to Oerlinghausen | 870.70 mi (1,401.26 km) |
| Harlau to Oestrich-Winkel | 877.76 mi (1,412.62 km) |
| Harlau to Offenburg | 878.96 mi (1,414.55 km) |
| Harlau to Oftersheim | 849.18 mi (1,366.63 km) |
| Harlau to Ohrdruf | 766.44 mi (1,233.47 km) |
| Harlau to Ohringen | 807.52 mi (1,299.58 km) |
| Harlau to Olbernhau | 653.20 mi (1,051.23 km) |
| Harlau to Olching | 724.29 mi (1,165.63 km) |
| Harlau to Oldenburg | 911.45 mi (1,466.84 km) |
| Harlau to Oldenburg in Holstein | 841.94 mi (1,354.97 km) |
| Harlau to Olfen | 920.47 mi (1,481.36 km) |
| Harlau to Olpe | 893.05 mi (1,437.22 km) |
| Harlau to Olsberg | 869.23 mi (1,398.88 km) |
| Harlau to Oranienburg | 707.43 mi (1,138.50 km) |
| Harlau to Ortenberg | 833.77 mi (1,341.82 km) |
