| Oeiras to Oberkirch | 1,100.55 mi (1,771.16 km) |
| Oeiras to Obernburg am Main | 1,189.42 mi (1,914.18 km) |
| Oeiras to Obernkirchen | 1,288.26 mi (2,073.26 km) |
| Oeiras to Oberschleissheim | 1,232.23 mi (1,983.08 km) |
| Oeiras to Oberstdorf | 1,153.80 mi (1,856.86 km) |
| Oeiras to Obertraubling | 1,278.10 mi (2,056.90 km) |
| Oeiras to Obertshausen | 1,186.81 mi (1,909.99 km) |
| Oeiras to Oberursel | 1,182.93 mi (1,903.74 km) |
| Oeiras to Ochsenfurt | 1,217.35 mi (1,959.14 km) |
| Oeiras to Ochsenhausen | 1,159.72 mi (1,866.38 km) |
| Oeiras to Ochtrup | 1,224.24 mi (1,970.22 km) |
| Oeiras to Odenthal | 1,167.79 mi (1,879.37 km) |
| Oeiras to Oelde | 1,237.52 mi (1,991.60 km) |
| Oeiras to Oelsnitz | 1,324.54 mi (2,131.64 km) |
| Oeiras to Oer-Erkenschwick | 1,199.84 mi (1,930.96 km) |
