| Barrhead to Oerlinghausen | 592.78 mi (953.99 km) |
| Barrhead to Oestrich-Winkel | 652.05 mi (1,049.38 km) |
| Barrhead to Offenburg | 725.97 mi (1,168.33 km) |
| Barrhead to Oftersheim | 700.94 mi (1,128.05 km) |
| Barrhead to Ohrdruf | 710.39 mi (1,143.26 km) |
| Barrhead to Ohringen | 738.87 mi (1,189.10 km) |
| Barrhead to Olbernhau | 811.16 mi (1,305.43 km) |
| Barrhead to Olching | 846.49 mi (1,362.29 km) |
| Barrhead to Oldenburg | 537.35 mi (864.78 km) |
| Barrhead to Oldenburg in Holstein | 612.01 mi (984.93 km) |
| Barrhead to Olfen | 556.50 mi (895.60 km) |
| Barrhead to Olpe | 600.92 mi (967.09 km) |
| Barrhead to Olsberg | 609.74 mi (981.28 km) |
| Barrhead to Oranienburg | 739.22 mi (1,189.66 km) |
| Barrhead to Ortenberg | 671.22 mi (1,080.23 km) |
