| Hardenberg to Oegstgeest | 94.47 mi (152.04 km) |
| Hardenberg to Oirschot | 92.54 mi (148.93 km) |
| Hardenberg to Oisterwijk | 90.75 mi (146.05 km) |
| Hardenberg to Oldebroek | 31.20 mi (50.21 km) |
| Hardenberg to Oldenzaal | 21.82 mi (35.12 km) |
| Hardenberg to Ommen | 9.09 mi (14.62 km) |
| Hardenberg to Oosterend | 37.95 mi (61.07 km) |
| Hardenberg to Oosterhout | 98.23 mi (158.08 km) |
| Hardenberg to Oosterwolde | 32.27 mi (51.94 km) |
| Hardenberg to Oostzaan | 73.49 mi (118.27 km) |
| Hardenberg to Opmeer | 70.49 mi (113.45 km) |
| Hardenberg to Oss | 72.31 mi (116.37 km) |
| Hardenberg to Oud-Beijerland | 107.23 mi (172.58 km) |
| Hardenberg to Oudenbosch | 111.61 mi (179.62 km) |
| Hardenberg to Oudewater | 83.14 mi (133.81 km) |
