| Harnes to Oestrich-Winkel | 227.24 mi (365.71 km) |
| Harnes to Offenburg | 263.86 mi (424.65 km) |
| Harnes to Oftersheim | 263.30 mi (423.74 km) |
| Harnes to Ohrdruf | 343.85 mi (553.37 km) |
| Harnes to Ohringen | 306.15 mi (492.70 km) |
| Harnes to Olbernhau | 457.61 mi (736.45 km) |
| Harnes to Olching | 409.02 mi (658.25 km) |
| Harnes to Oldenburg | 293.51 mi (472.36 km) |
| Harnes to Oldenburg in Holstein | 428.74 mi (689.98 km) |
| Harnes to Olfen | 213.24 mi (343.18 km) |
| Harnes to Olpe | 219.04 mi (352.52 km) |
| Harnes to Olsberg | 250.90 mi (403.78 km) |
| Harnes to Oranienburg | 470.71 mi (757.54 km) |
| Harnes to Ortenberg | 270.83 mi (435.85 km) |
| Harnes to Oschatz | 448.33 mi (721.51 km) |
