| Lake Oswego to Octeville | 4,979.02 mi (8,012.97 km) |
| Lake Oswego to Oignies | 5,059.42 mi (8,142.35 km) |
| Lake Oswego to Oissel | 5,070.63 mi (8,160.39 km) |
| Lake Oswego to Olivet | 5,174.36 mi (8,327.33 km) |
| Lake Oswego to Ollioules | 5,551.09 mi (8,933.62 km) |
| Lake Oswego to Olonne-sur-Mer | 5,141.36 mi (8,274.22 km) |
| Lake Oswego to Oloron-Sainte-Marie | 5,358.30 mi (8,623.35 km) |
| Lake Oswego to Onet Village | 5,388.80 mi (8,672.44 km) |
| Lake Oswego to Onnaing | 5,079.72 mi (8,175.02 km) |
| Lake Oswego to Orange | 5,464.86 mi (8,794.84 km) |
| Lake Oswego to Orchies | 5,065.66 mi (8,152.40 km) |
| Lake Oswego to Orleans | 5,172.46 mi (8,324.26 km) |
| Lake Oswego to Orly | 5,139.12 mi (8,270.61 km) |
| Lake Oswego to Ormesson-sur-Marne | 5,140.74 mi (8,273.22 km) |
| Lake Oswego to Orsay | 5,136.07 mi (8,265.70 km) |
