| Castelo Branco to Oberkirch | 976.14 mi (1,570.94 km) |
| Castelo Branco to Obernburg am Main | 1,065.62 mi (1,714.95 km) |
| Castelo Branco to Obernkirchen | 1,167.14 mi (1,878.34 km) |
| Castelo Branco to Oberschleissheim | 1,107.41 mi (1,782.21 km) |
| Castelo Branco to Oberstdorf | 1,029.03 mi (1,656.07 km) |
| Castelo Branco to Obertraubling | 1,153.32 mi (1,856.08 km) |
| Castelo Branco to Obertshausen | 1,063.33 mi (1,711.27 km) |
| Castelo Branco to Oberursel | 1,059.69 mi (1,705.41 km) |
| Castelo Branco to Ochsenfurt | 1,093.13 mi (1,759.23 km) |
| Castelo Branco to Ochsenhausen | 1,034.91 mi (1,665.53 km) |
| Castelo Branco to Ochtrup | 1,104.56 mi (1,777.62 km) |
| Castelo Branco to Odenthal | 1,046.45 mi (1,684.09 km) |
| Castelo Branco to Oelde | 1,116.51 mi (1,796.85 km) |
| Castelo Branco to Oelsnitz | 1,200.31 mi (1,931.71 km) |
| Castelo Branco to Oer-Erkenschwick | 1,079.26 mi (1,736.91 km) |
