| Marinha Grande to Oberkirch | 1,035.51 mi (1,666.49 km) |
| Marinha Grande to Obernburg am Main | 1,122.55 mi (1,806.57 km) |
| Marinha Grande to Obernkirchen | 1,217.55 mi (1,959.47 km) |
| Marinha Grande to Oberschleissheim | 1,170.65 mi (1,883.99 km) |
| Marinha Grande to Oberstdorf | 1,093.42 mi (1,759.68 km) |
| Marinha Grande to Obertraubling | 1,215.27 mi (1,955.79 km) |
| Marinha Grande to Obertshausen | 1,119.28 mi (1,801.31 km) |
| Marinha Grande to Oberursel | 1,114.95 mi (1,794.34 km) |
| Marinha Grande to Ochsenfurt | 1,151.56 mi (1,853.26 km) |
| Marinha Grande to Ochsenhausen | 1,097.36 mi (1,766.03 km) |
| Marinha Grande to Ochtrup | 1,152.38 mi (1,854.57 km) |
| Marinha Grande to Odenthal | 1,097.37 mi (1,766.05 km) |
| Marinha Grande to Oelde | 1,166.75 mi (1,877.70 km) |
| Marinha Grande to Oelsnitz | 1,258.74 mi (2,025.74 km) |
| Marinha Grande to Oer-Erkenschwick | 1,128.70 mi (1,816.47 km) |
