| Douglas to Oberkirch | 764.21 mi (1,229.88 km) |
| Douglas to Obernburg am Main | 777.42 mi (1,251.14 km) |
| Douglas to Obernkirchen | 744.17 mi (1,197.62 km) |
| Douglas to Oberschleissheim | 918.58 mi (1,478.31 km) |
| Douglas to Oberstdorf | 889.33 mi (1,431.24 km) |
| Douglas to Obertraubling | 925.64 mi (1,489.68 km) |
| Douglas to Obertshausen | 759.82 mi (1,222.81 km) |
| Douglas to Oberursel | 746.32 mi (1,201.09 km) |
| Douglas to Ochsenfurt | 820.77 mi (1,320.90 km) |
| Douglas to Ochsenhausen | 855.44 mi (1,376.70 km) |
| Douglas to Ochtrup | 663.20 mi (1,067.31 km) |
| Douglas to Odenthal | 670.84 mi (1,079.61 km) |
| Douglas to Oelde | 706.29 mi (1,136.66 km) |
| Douglas to Oelsnitz | 895.63 mi (1,441.38 km) |
| Douglas to Oer-Erkenschwick | 669.76 mi (1,077.87 km) |
