| Barreiro to Oerlinghausen | 1,253.07 mi (2,016.62 km) |
| Barreiro to Oestrich-Winkel | 1,145.88 mi (1,844.12 km) |
| Barreiro to Offenburg | 1,083.38 mi (1,743.53 km) |
| Barreiro to Oftersheim | 1,142.22 mi (1,838.23 km) |
| Barreiro to Ohrdruf | 1,277.24 mi (2,055.52 km) |
| Barreiro to Ohringen | 1,170.64 mi (1,883.97 km) |
| Barreiro to Olbernhau | 1,368.92 mi (2,203.06 km) |
| Barreiro to Olching | 1,210.64 mi (1,948.34 km) |
| Barreiro to Oldenburg | 1,293.31 mi (2,081.38 km) |
| Barreiro to Oldenburg in Holstein | 1,427.76 mi (2,297.76 km) |
| Barreiro to Olfen | 1,200.47 mi (1,931.97 km) |
| Barreiro to Olpe | 1,183.47 mi (1,904.61 km) |
| Barreiro to Olsberg | 1,219.84 mi (1,963.14 km) |
| Barreiro to Oranienburg | 1,439.99 mi (2,317.44 km) |
| Barreiro to Ortenberg | 1,198.11 mi (1,928.17 km) |
