| Hafnarfjordhur to Oberkirch | 1,546.14 mi (2,488.28 km) |
| Hafnarfjordhur to Obernburg am Main | 1,501.86 mi (2,417.01 km) |
| Hafnarfjordhur to Obernkirchen | 1,372.15 mi (2,208.26 km) |
| Hafnarfjordhur to Oberschleissheim | 1,655.73 mi (2,664.65 km) |
| Hafnarfjordhur to Oberstdorf | 1,668.01 mi (2,684.41 km) |
| Hafnarfjordhur to Obertraubling | 1,632.91 mi (2,627.92 km) |
| Hafnarfjordhur to Obertshausen | 1,481.09 mi (2,383.59 km) |
| Hafnarfjordhur to Oberursel | 1,466.67 mi (2,360.38 km) |
| Hafnarfjordhur to Ochsenfurt | 1,537.54 mi (2,474.43 km) |
| Hafnarfjordhur to Ochsenhausen | 1,621.74 mi (2,609.94 km) |
| Hafnarfjordhur to Ochtrup | 1,321.58 mi (2,126.88 km) |
| Hafnarfjordhur to Odenthal | 1,382.01 mi (2,224.13 km) |
| Hafnarfjordhur to Oelde | 1,367.66 mi (2,201.03 km) |
| Hafnarfjordhur to Oelsnitz | 1,554.87 mi (2,502.32 km) |
| Hafnarfjordhur to Oer-Erkenschwick | 1,353.00 mi (2,177.44 km) |
