| Barcelos to Oberkirch | 945.75 mi (1,522.04 km) |
| Barcelos to Obernburg am Main | 1,028.22 mi (1,654.76 km) |
| Barcelos to Obernkirchen | 1,113.89 mi (1,792.63 km) |
| Barcelos to Oberschleissheim | 1,087.77 mi (1,750.60 km) |
| Barcelos to Oberstdorf | 1,013.49 mi (1,631.06 km) |
| Barcelos to Obertraubling | 1,129.50 mi (1,817.75 km) |
| Barcelos to Obertshausen | 1,023.45 mi (1,647.08 km) |
| Barcelos to Oberursel | 1,018.10 mi (1,638.47 km) |
| Barcelos to Ochsenfurt | 1,059.57 mi (1,705.21 km) |
| Barcelos to Ochsenhausen | 1,013.18 mi (1,630.56 km) |
| Barcelos to Ochtrup | 1,045.98 mi (1,683.34 km) |
| Barcelos to Odenthal | 994.74 mi (1,600.88 km) |
| Barcelos to Oelde | 1,063.03 mi (1,710.79 km) |
| Barcelos to Oelsnitz | 1,166.31 mi (1,877.00 km) |
| Barcelos to Oer-Erkenschwick | 1,024.18 mi (1,648.26 km) |
