| Hartlepool to Oberkirch | 582.11 mi (936.81 km) |
| Hartlepool to Obernburg am Main | 550.34 mi (885.69 km) |
| Hartlepool to Obernkirchen | 455.96 mi (733.80 km) |
| Hartlepool to Oberschleissheim | 705.55 mi (1,135.47 km) |
| Hartlepool to Oberstdorf | 706.88 mi (1,137.62 km) |
| Hartlepool to Obertraubling | 692.97 mi (1,115.22 km) |
| Hartlepool to Obertshausen | 529.72 mi (852.50 km) |
| Hartlepool to Oberursel | 514.96 mi (828.74 km) |
| Hartlepool to Ochsenfurt | 590.15 mi (949.76 km) |
| Hartlepool to Ochsenhausen | 662.34 mi (1,065.93 km) |
| Hartlepool to Ochtrup | 385.60 mi (620.57 km) |
| Hartlepool to Odenthal | 429.06 mi (690.50 km) |
| Hartlepool to Oelde | 433.81 mi (698.15 km) |
| Hartlepool to Oelsnitz | 633.38 mi (1,019.33 km) |
| Hartlepool to Oer-Erkenschwick | 408.46 mi (657.35 km) |
