| Ballincollig to Octeville | 341.25 mi (549.19 km) |
| Ballincollig to Oignies | 510.61 mi (821.75 km) |
| Ballincollig to Oissel | 458.98 mi (738.65 km) |
| Ballincollig to Olivet | 542.81 mi (873.57 km) |
| Ballincollig to Ollioules | 902.16 mi (1,451.88 km) |
| Ballincollig to Olonne-sur-Mer | 480.61 mi (773.46 km) |
| Ballincollig to Oloron-Sainte-Marie | 705.76 mi (1,135.81 km) |
| Ballincollig to Onet Village | 730.64 mi (1,175.86 km) |
| Ballincollig to Onnaing | 537.75 mi (865.42 km) |
| Ballincollig to Orange | 816.41 mi (1,313.89 km) |
| Ballincollig to Orchies | 521.13 mi (838.68 km) |
| Ballincollig to Orleans | 541.62 mi (871.65 km) |
| Ballincollig to Orly | 530.30 mi (853.43 km) |
| Ballincollig to Ormesson-sur-Marne | 534.78 mi (860.65 km) |
| Ballincollig to Orsay | 523.60 mi (842.65 km) |
