| Klamath Falls to Octeville | 5,131.50 mi (8,258.34 km) |
| Klamath Falls to Oignies | 5,220.26 mi (8,401.19 km) |
| Klamath Falls to Oissel | 5,226.64 mi (8,411.47 km) |
| Klamath Falls to Olivet | 5,328.91 mi (8,576.05 km) |
| Klamath Falls to Ollioules | 5,703.92 mi (9,179.57 km) |
| Klamath Falls to Olonne-sur-Mer | 5,287.52 mi (8,509.44 km) |
| Klamath Falls to Oloron-Sainte-Marie | 5,499.85 mi (8,851.16 km) |
| Klamath Falls to Onet Village | 5,538.14 mi (8,912.78 km) |
| Klamath Falls to Onnaing | 5,241.29 mi (8,435.04 km) |
| Klamath Falls to Orange | 5,617.59 mi (9,040.64 km) |
| Klamath Falls to Orchies | 5,226.87 mi (8,411.84 km) |
| Klamath Falls to Orleans | 5,327.09 mi (8,573.12 km) |
| Klamath Falls to Orly | 5,296.01 mi (8,523.11 km) |
| Klamath Falls to Ormesson-sur-Marne | 5,297.93 mi (8,526.19 km) |
| Klamath Falls to Orsay | 5,292.57 mi (8,517.56 km) |
