| Barrhead to Octeville | 441.71 mi (710.86 km) |
| Barrhead to Oignies | 478.38 mi (769.88 km) |
| Barrhead to Oissel | 501.76 mi (807.50 km) |
| Barrhead to Olivet | 610.03 mi (981.75 km) |
| Barrhead to Ollioules | 985.81 mi (1,586.51 km) |
| Barrhead to Olonne-sur-Mer | 649.98 mi (1,046.04 km) |
| Barrhead to Oloron-Sainte-Marie | 887.09 mi (1,427.63 km) |
| Barrhead to Onet Village | 847.56 mi (1,364.01 km) |
| Barrhead to Onnaing | 499.08 mi (803.18 km) |
| Barrhead to Orange | 901.78 mi (1,451.27 km) |
| Barrhead to Orchies | 484.75 mi (780.13 km) |
| Barrhead to Orleans | 607.75 mi (978.08 km) |
| Barrhead to Orly | 565.05 mi (909.36 km) |
| Barrhead to Ormesson-sur-Marne | 565.62 mi (910.27 km) |
| Barrhead to Orsay | 563.55 mi (906.95 km) |
