| Barrhead to Oberkirch | 727.05 mi (1,170.08 km) |
| Barrhead to Obernburg am Main | 697.19 mi (1,122.01 km) |
| Barrhead to Obernkirchen | 598.75 mi (963.59 km) |
| Barrhead to Oberschleissheim | 852.38 mi (1,371.77 km) |
| Barrhead to Oberstdorf | 852.60 mi (1,372.12 km) |
| Barrhead to Obertraubling | 839.59 mi (1,351.18 km) |
| Barrhead to Obertshausen | 676.57 mi (1,088.83 km) |
| Barrhead to Oberursel | 661.80 mi (1,065.07 km) |
| Barrhead to Ochsenfurt | 736.97 mi (1,186.04 km) |
| Barrhead to Ochsenhausen | 808.47 mi (1,301.11 km) |
| Barrhead to Ochtrup | 530.89 mi (854.38 km) |
| Barrhead to Odenthal | 575.91 mi (926.83 km) |
| Barrhead to Oelde | 579.12 mi (932.01 km) |
| Barrhead to Oelsnitz | 778.22 mi (1,252.42 km) |
| Barrhead to Oer-Erkenschwick | 554.85 mi (892.95 km) |
