| Portici to Oberkirch | 614.79 mi (989.41 km) |
| Portici to Obernburg am Main | 672.06 mi (1,081.58 km) |
| Portici to Obernkirchen | 828.38 mi (1,333.15 km) |
| Portici to Oberschleissheim | 531.16 mi (854.82 km) |
| Portici to Oberstdorf | 497.74 mi (801.03 km) |
| Portici to Obertraubling | 572.75 mi (921.75 km) |
| Portici to Obertshausen | 691.97 mi (1,113.62 km) |
| Portici to Oberursel | 705.33 mi (1,135.12 km) |
| Portici to Ochsenfurt | 644.31 mi (1,036.92 km) |
| Portici to Ochsenhausen | 545.71 mi (878.24 km) |
| Portici to Ochtrup | 856.01 mi (1,377.62 km) |
| Portici to Odenthal | 785.57 mi (1,264.26 km) |
| Portici to Oelde | 815.55 mi (1,312.50 km) |
| Portici to Oelsnitz | 671.28 mi (1,080.33 km) |
| Portici to Oer-Erkenschwick | 820.03 mi (1,319.72 km) |
