| The Hills to Oberkirch | 3,903.48 mi (6,282.04 km) |
| The Hills to Obernburg am Main | 3,907.86 mi (6,289.10 km) |
| The Hills to Obernkirchen | 3,837.14 mi (6,175.29 km) |
| The Hills to Oberschleissheim | 4,055.16 mi (6,526.15 km) |
| The Hills to Oberstdorf | 4,029.00 mi (6,484.04 km) |
| The Hills to Obertraubling | 4,056.54 mi (6,528.38 km) |
| The Hills to Obertshausen | 3,888.80 mi (6,258.42 km) |
| The Hills to Oberursel | 3,874.53 mi (6,235.45 km) |
| The Hills to Ochsenfurt | 3,950.79 mi (6,358.17 km) |
| The Hills to Ochsenhausen | 3,994.45 mi (6,428.44 km) |
| The Hills to Ochtrup | 3,763.88 mi (6,057.38 km) |
| The Hills to Odenthal | 3,792.68 mi (6,103.73 km) |
| The Hills to Oelde | 3,811.50 mi (6,134.02 km) |
| The Hills to Oelsnitz | 4,010.73 mi (6,454.65 km) |
| The Hills to Oer-Erkenschwick | 3,781.39 mi (6,085.56 km) |
