| Kirkwall to Oberkirch | 848.80 mi (1,366.01 km) |
| Kirkwall to Obernburg am Main | 794.76 mi (1,279.05 km) |
| Kirkwall to Obernkirchen | 659.39 mi (1,061.19 km) |
| Kirkwall to Oberschleissheim | 946.69 mi (1,523.56 km) |
| Kirkwall to Oberstdorf | 965.48 mi (1,553.79 km) |
| Kirkwall to Obertraubling | 921.34 mi (1,482.76 km) |
| Kirkwall to Obertshausen | 774.18 mi (1,245.92 km) |
| Kirkwall to Oberursel | 760.10 mi (1,223.26 km) |
| Kirkwall to Ochsenfurt | 828.47 mi (1,333.29 km) |
| Kirkwall to Ochsenhausen | 918.09 mi (1,477.53 km) |
| Kirkwall to Ochtrup | 612.01 mi (984.94 km) |
| Kirkwall to Odenthal | 677.40 mi (1,090.17 km) |
| Kirkwall to Oelde | 656.98 mi (1,057.31 km) |
| Kirkwall to Oelsnitz | 841.89 mi (1,354.89 km) |
| Kirkwall to Oer-Erkenschwick | 645.31 mi (1,038.53 km) |
