| Caldas da Rainha to Oberkirch | 1,059.34 mi (1,704.84 km) |
| Caldas da Rainha to Obernburg am Main | 1,146.86 mi (1,845.70 km) |
| Caldas da Rainha to Obernkirchen | 1,242.80 mi (2,000.09 km) |
| Caldas da Rainha to Oberschleissheim | 1,193.56 mi (1,920.86 km) |
| Caldas da Rainha to Oberstdorf | 1,115.98 mi (1,796.00 km) |
| Caldas da Rainha to Obertraubling | 1,238.53 mi (1,993.22 km) |
| Caldas da Rainha to Obertshausen | 1,143.76 mi (1,840.71 km) |
| Caldas da Rainha to Oberursel | 1,139.54 mi (1,833.92 km) |
| Caldas da Rainha to Ochsenfurt | 1,175.60 mi (1,891.95 km) |
| Caldas da Rainha to Ochsenhausen | 1,120.47 mi (1,803.23 km) |
| Caldas da Rainha to Ochtrup | 1,177.86 mi (1,895.58 km) |
| Caldas da Rainha to Odenthal | 1,122.54 mi (1,806.55 km) |
| Caldas da Rainha to Oelde | 1,192.00 mi (1,918.34 km) |
| Caldas da Rainha to Oelsnitz | 1,282.79 mi (2,064.46 km) |
| Caldas da Rainha to Oer-Erkenschwick | 1,154.03 mi (1,857.23 km) |
