| Ianca to Octeville | 1,387.80 mi (2,233.45 km) |
| Ianca to Oignies | 1,188.08 mi (1,912.03 km) |
| Ianca to Oissel | 1,264.33 mi (2,034.74 km) |
| Ianca to Olivet | 1,225.08 mi (1,971.57 km) |
| Ianca to Ollioules | 1,077.99 mi (1,734.85 km) |
| Ianca to Olonne-sur-Mer | 1,403.18 mi (2,258.20 km) |
| Ianca to Oloron-Sainte-Marie | 1,391.20 mi (2,238.92 km) |
| Ianca to Onet Village | 1,217.22 mi (1,958.92 km) |
| Ianca to Onnaing | 1,160.92 mi (1,868.33 km) |
| Ianca to Orange | 1,112.79 mi (1,790.87 km) |
| Ianca to Orchies | 1,177.24 mi (1,894.59 km) |
| Ianca to Orleans | 1,224.66 mi (1,970.90 km) |
| Ianca to Orly | 1,203.40 mi (1,936.69 km) |
| Ianca to Ormesson-sur-Marne | 1,196.91 mi (1,926.25 km) |
| Ianca to Orsay | 1,212.62 mi (1,951.53 km) |
