| Irmo to Octeville | 4,033.12 mi (6,490.67 km) |
| Irmo to Oignies | 4,210.25 mi (6,775.74 km) |
| Irmo to Oissel | 4,155.95 mi (6,688.35 km) |
| Irmo to Olivet | 4,224.96 mi (6,799.42 km) |
| Irmo to Ollioules | 4,526.26 mi (7,284.31 km) |
| Irmo to Olonne-sur-Mer | 4,092.86 mi (6,586.82 km) |
| Irmo to Oloron-Sainte-Marie | 4,225.27 mi (6,799.91 km) |
| Irmo to Onet Village | 4,343.60 mi (6,990.34 km) |
| Irmo to Onnaing | 4,237.19 mi (6,819.10 km) |
| Irmo to Orange | 4,450.68 mi (7,162.68 km) |
| Irmo to Orchies | 4,220.50 mi (6,792.24 km) |
| Irmo to Orleans | 4,224.41 mi (6,798.53 km) |
| Irmo to Orly | 4,225.29 mi (6,799.95 km) |
| Irmo to Ormesson-sur-Marne | 4,230.52 mi (6,808.36 km) |
| Irmo to Orsay | 4,217.58 mi (6,787.53 km) |
