| McDonough to Oberkirch | 4,626.40 mi (7,445.48 km) |
| McDonough to Obernburg am Main | 4,631.36 mi (7,453.45 km) |
| McDonough to Obernkirchen | 4,560.32 mi (7,339.13 km) |
| McDonough to Oberschleissheim | 4,778.46 mi (7,690.18 km) |
| McDonough to Oberstdorf | 4,751.69 mi (7,647.11 km) |
| McDonough to Obertraubling | 4,780.05 mi (7,692.75 km) |
| McDonough to Obertshausen | 4,612.31 mi (7,422.80 km) |
| McDonough to Oberursel | 4,598.05 mi (7,399.84 km) |
| McDonough to Ochsenfurt | 4,674.29 mi (7,522.54 km) |
| McDonough to Ochsenhausen | 4,717.45 mi (7,591.99 km) |
| McDonough to Ochtrup | 4,487.26 mi (7,221.55 km) |
| McDonough to Odenthal | 4,516.23 mi (7,268.16 km) |
| McDonough to Oelde | 4,534.92 mi (7,298.25 km) |
| McDonough to Oelsnitz | 4,734.20 mi (7,618.96 km) |
| McDonough to Oer-Erkenschwick | 4,504.89 mi (7,249.93 km) |
