| North Hykeham to Oberkirch | 495.62 mi (797.62 km) |
| North Hykeham to Obernburg am Main | 477.32 mi (768.17 km) |
| North Hykeham to Obernkirchen | 410.71 mi (660.97 km) |
| North Hykeham to Oberschleissheim | 630.32 mi (1,014.40 km) |
| North Hykeham to Oberstdorf | 622.68 mi (1,002.11 km) |
| North Hykeham to Obertraubling | 624.46 mi (1,004.97 km) |
| North Hykeham to Obertshausen | 457.38 mi (736.09 km) |
| North Hykeham to Oberursel | 442.77 mi (712.57 km) |
| North Hykeham to Ochsenfurt | 519.24 mi (835.64 km) |
| North Hykeham to Ochsenhausen | 580.36 mi (933.99 km) |
| North Hykeham to Ochtrup | 332.45 mi (535.02 km) |
| North Hykeham to Odenthal | 358.85 mi (577.52 km) |
| North Hykeham to Oelde | 378.83 mi (609.67 km) |
| North Hykeham to Oelsnitz | 576.56 mi (927.89 km) |
| North Hykeham to Oer-Erkenschwick | 346.87 mi (558.23 km) |
