| Barcelos to Oerlinghausen | 1,086.35 mi (1,748.31 km) |
| Barcelos to Oestrich-Winkel | 988.93 mi (1,591.53 km) |
| Barcelos to Offenburg | 937.59 mi (1,508.91 km) |
| Barcelos to Oftersheim | 991.30 mi (1,595.35 km) |
| Barcelos to Ohrdruf | 1,121.93 mi (1,805.58 km) |
| Barcelos to Ohringen | 1,023.45 mi (1,647.08 km) |
| Barcelos to Olbernhau | 1,220.20 mi (1,963.72 km) |
| Barcelos to Olching | 1,075.76 mi (1,731.27 km) |
| Barcelos to Oldenburg | 1,120.05 mi (1,802.54 km) |
| Barcelos to Oldenburg in Holstein | 1,255.22 mi (2,020.07 km) |
| Barcelos to Olfen | 1,031.81 mi (1,660.54 km) |
| Barcelos to Olpe | 1,019.77 mi (1,641.16 km) |
| Barcelos to Olsberg | 1,055.96 mi (1,699.40 km) |
| Barcelos to Oranienburg | 1,279.01 mi (2,058.36 km) |
| Barcelos to Ortenberg | 1,041.68 mi (1,676.42 km) |
