| Barreiro to Oberkirch | 1,091.64 mi (1,756.83 km) |
| Barreiro to Obernburg am Main | 1,180.98 mi (1,900.60 km) |
| Barreiro to Obernkirchen | 1,281.05 mi (2,061.65 km) |
| Barreiro to Oberschleissheim | 1,222.53 mi (1,967.46 km) |
| Barreiro to Oberstdorf | 1,143.87 mi (1,840.89 km) |
| Barreiro to Obertraubling | 1,268.65 mi (2,041.70 km) |
| Barreiro to Obertshausen | 1,178.56 mi (1,896.71 km) |
| Barreiro to Oberursel | 1,174.80 mi (1,890.67 km) |
| Barreiro to Ochsenfurt | 1,208.61 mi (1,945.08 km) |
| Barreiro to Ochsenhausen | 1,150.19 mi (1,851.05 km) |
| Barreiro to Ochtrup | 1,217.50 mi (1,959.38 km) |
| Barreiro to Odenthal | 1,160.48 mi (1,867.61 km) |
| Barreiro to Oelde | 1,230.34 mi (1,980.04 km) |
| Barreiro to Oelsnitz | 1,315.79 mi (2,117.56 km) |
| Barreiro to Oer-Erkenschwick | 1,192.81 mi (1,919.64 km) |
