| Fort Thomas to Oberkirch | 4,372.13 mi (7,036.26 km) |
| Fort Thomas to Obernburg am Main | 4,368.77 mi (7,030.86 km) |
| Fort Thomas to Obernkirchen | 4,285.95 mi (6,897.57 km) |
| Fort Thomas to Oberschleissheim | 4,519.39 mi (7,273.26 km) |
| Fort Thomas to Oberstdorf | 4,499.07 mi (7,240.56 km) |
| Fort Thomas to Obertraubling | 4,516.50 mi (7,268.60 km) |
| Fort Thomas to Obertshausen | 4,349.12 mi (6,999.23 km) |
| Fort Thomas to Oberursel | 4,334.59 mi (6,975.85 km) |
| Fort Thomas to Ochsenfurt | 4,411.09 mi (7,098.96 km) |
| Fort Thomas to Ochsenhausen | 4,462.17 mi (7,181.17 km) |
| Fort Thomas to Ochtrup | 4,215.98 mi (6,784.97 km) |
| Fort Thomas to Odenthal | 4,250.92 mi (6,841.19 km) |
| Fort Thomas to Oelde | 4,264.08 mi (6,862.38 km) |
| Fort Thomas to Oelsnitz | 4,463.83 mi (7,183.84 km) |
| Fort Thomas to Oer-Erkenschwick | 4,236.34 mi (6,817.72 km) |
