| Harsova to Oerlinghausen | 1,014.39 mi (1,632.50 km) |
| Harsova to Oestrich-Winkel | 999.97 mi (1,609.29 km) |
| Harsova to Offenburg | 982.87 mi (1,581.77 km) |
| Harsova to Oftersheim | 964.67 mi (1,552.48 km) |
| Harsova to Ohrdruf | 902.51 mi (1,452.44 km) |
| Harsova to Ohringen | 921.84 mi (1,483.56 km) |
| Harsova to Olbernhau | 793.81 mi (1,277.51 km) |
| Harsova to Olching | 826.55 mi (1,330.20 km) |
| Harsova to Oldenburg | 1,064.55 mi (1,713.23 km) |
| Harsova to Oldenburg in Holstein | 1,009.33 mi (1,624.37 km) |
| Harsova to Olfen | 1,059.58 mi (1,705.23 km) |
| Harsova to Olpe | 1,025.97 mi (1,651.14 km) |
| Harsova to Olsberg | 1,006.57 mi (1,619.92 km) |
| Harsova to Oranienburg | 869.42 mi (1,399.19 km) |
| Harsova to Ortenberg | 961.42 mi (1,547.26 km) |
