| Harderwijk to Oerlinghausen | 131.96 mi (212.36 km) |
| Harderwijk to Oestrich-Winkel | 192.39 mi (309.62 km) |
| Harderwijk to Offenburg | 287.01 mi (461.90 km) |
| Harderwijk to Oftersheim | 243.12 mi (391.27 km) |
| Harderwijk to Ohrdruf | 243.42 mi (391.75 km) |
| Harderwijk to Ohringen | 275.88 mi (443.99 km) |
| Harderwijk to Olbernhau | 351.42 mi (565.56 km) |
| Harderwijk to Olching | 381.30 mi (613.65 km) |
| Harderwijk to Oldenburg | 121.68 mi (195.83 km) |
| Harderwijk to Oldenburg in Holstein | 255.61 mi (411.37 km) |
| Harderwijk to Olfen | 86.91 mi (139.86 km) |
| Harderwijk to Olpe | 132.29 mi (212.90 km) |
| Harderwijk to Olsberg | 140.49 mi (226.10 km) |
| Harderwijk to Oranienburg | 321.20 mi (516.92 km) |
| Harderwijk to Ortenberg | 202.44 mi (325.80 km) |
