| Webster Groves to Oberkirch | 4,626.33 mi (7,445.36 km) |
| Webster Groves to Obernburg am Main | 4,617.37 mi (7,430.94 km) |
| Webster Groves to Obernkirchen | 4,526.30 mi (7,284.38 km) |
| Webster Groves to Oberschleissheim | 4,769.86 mi (7,676.34 km) |
| Webster Groves to Oberstdorf | 4,753.90 mi (7,650.66 km) |
| Webster Groves to Obertraubling | 4,763.87 mi (7,666.71 km) |
| Webster Groves to Obertshausen | 4,597.37 mi (7,398.75 km) |
| Webster Groves to Oberursel | 4,582.72 mi (7,375.17 km) |
| Webster Groves to Ochsenfurt | 4,659.10 mi (7,498.10 km) |
| Webster Groves to Ochsenhausen | 4,715.39 mi (7,588.69 km) |
| Webster Groves to Ochtrup | 4,458.94 mi (7,175.97 km) |
| Webster Groves to Odenthal | 4,498.06 mi (7,238.93 km) |
| Webster Groves to Oelde | 4,507.17 mi (7,253.59 km) |
| Webster Groves to Oelsnitz | 4,706.48 mi (7,574.35 km) |
| Webster Groves to Oer-Erkenschwick | 4,481.21 mi (7,211.80 km) |
