| Ardahan to Oberkirch | 1,755.41 mi (2,825.05 km) |
| Ardahan to Obernburg am Main | 1,716.92 mi (2,763.12 km) |
| Ardahan to Obernkirchen | 1,747.56 mi (2,812.43 km) |
| Ardahan to Oberschleissheim | 1,594.49 mi (2,566.09 km) |
| Ardahan to Oberstdorf | 1,649.13 mi (2,654.03 km) |
| Ardahan to Obertraubling | 1,573.73 mi (2,532.67 km) |
| Ardahan to Obertshausen | 1,732.60 mi (2,788.35 km) |
| Ardahan to Oberursel | 1,745.13 mi (2,808.52 km) |
| Ardahan to Ochsenfurt | 1,674.20 mi (2,694.37 km) |
| Ardahan to Ochsenhausen | 1,667.59 mi (2,683.73 km) |
| Ardahan to Ochtrup | 1,826.59 mi (2,939.62 km) |
| Ardahan to Odenthal | 1,816.52 mi (2,923.41 km) |
| Ardahan to Oelde | 1,781.72 mi (2,867.41 km) |
| Ardahan to Oelsnitz | 1,591.64 mi (2,561.50 km) |
| Ardahan to Oer-Erkenschwick | 1,817.27 mi (2,924.61 km) |
