| Cities | Distance |
|---|---|
| Harpenden to Nuth | 276.00 mi (444.18 km) |
| Harpenden to Oegstgeest | 206.51 mi (332.34 km) |
| Harpenden to Oirschot | 243.20 mi (391.39 km) |
| Harpenden to Oisterwijk | 238.26 mi (383.44 km) |
| Harpenden to Oldebroek | 268.66 mi (432.36 km) |
| Harpenden to Oldenzaal | 311.24 mi (500.89 km) |
| Harpenden to Ommen | 290.79 mi (467.99 km) |
| Harpenden to Oosterend | 282.56 mi (454.74 km) |
| Harpenden to Oosterhout | 223.20 mi (359.21 km) |
| Harpenden to Oosterwolde | 291.42 mi (469.00 km) |
| Harpenden to Oostzaan | 226.08 mi (363.84 km) |
| Harpenden to Opmeer | 232.33 mi (373.90 km) |
| Harpenden to Oss | 250.77 mi (403.58 km) |
| Harpenden to Oud-Beijerland | 202.95 mi (326.61 km) |
| Harpenden to Oudenbosch | 209.36 mi (336.93 km) |