| Walker Mill to Oberkirch | 4,074.27 mi (6,556.90 km) |
| Walker Mill to Obernburg am Main | 4,079.19 mi (6,564.82 km) |
| Walker Mill to Obernkirchen | 4,008.99 mi (6,451.84 km) |
| Walker Mill to Oberschleissheim | 4,226.25 mi (6,801.49 km) |
| Walker Mill to Oberstdorf | 4,199.63 mi (6,758.65 km) |
| Walker Mill to Obertraubling | 4,227.90 mi (6,804.14 km) |
| Walker Mill to Obertshausen | 4,060.17 mi (6,534.21 km) |
| Walker Mill to Oberursel | 4,045.91 mi (6,511.26 km) |
| Walker Mill to Ochsenfurt | 4,122.14 mi (6,633.94 km) |
| Walker Mill to Ochsenhausen | 4,165.29 mi (6,703.38 km) |
| Walker Mill to Ochtrup | 3,935.63 mi (6,333.78 km) |
| Walker Mill to Odenthal | 3,964.17 mi (6,379.72 km) |
| Walker Mill to Oelde | 3,983.23 mi (6,410.39 km) |
| Walker Mill to Oelsnitz | 4,182.42 mi (6,730.95 km) |
| Walker Mill to Oer-Erkenschwick | 3,953.04 mi (6,361.80 km) |
