| Cincinnati to Oberkirch | 4,371.44 mi (7,035.15 km) |
| Cincinnati to Obernburg am Main | 4,367.93 mi (7,029.51 km) |
| Cincinnati to Obernkirchen | 4,284.91 mi (6,895.89 km) |
| Cincinnati to Oberschleissheim | 4,518.61 mi (7,272.00 km) |
| Cincinnati to Oberstdorf | 4,498.41 mi (7,239.49 km) |
| Cincinnati to Obertraubling | 4,515.64 mi (7,267.22 km) |
| Cincinnati to Obertshausen | 4,348.27 mi (6,997.87 km) |
| Cincinnati to Oberursel | 4,333.74 mi (6,974.48 km) |
| Cincinnati to Ochsenfurt | 4,410.24 mi (7,097.60 km) |
| Cincinnati to Ochsenhausen | 4,461.46 mi (7,180.03 km) |
| Cincinnati to Ochtrup | 4,215.00 mi (6,783.39 km) |
| Cincinnati to Odenthal | 4,250.04 mi (6,839.78 km) |
| Cincinnati to Oelde | 4,263.10 mi (6,860.80 km) |
| Cincinnati to Oelsnitz | 4,462.85 mi (7,182.26 km) |
| Cincinnati to Oer-Erkenschwick | 4,235.40 mi (6,816.22 km) |
