| Lake Oswego to Nuth | 5,108.09 mi (8,220.68 km) |
| Lake Oswego to Oegstgeest | 5,001.50 mi (8,049.14 km) |
| Lake Oswego to Oirschot | 5,060.60 mi (8,144.24 km) |
| Lake Oswego to Oisterwijk | 5,053.42 mi (8,132.69 km) |
| Lake Oswego to Oldebroek | 5,021.66 mi (8,081.59 km) |
| Lake Oswego to Oldenzaal | 5,054.06 mi (8,133.73 km) |
| Lake Oswego to Ommen | 5,030.33 mi (8,095.53 km) |
| Lake Oswego to Oosterend | 4,994.36 mi (8,037.65 km) |
| Lake Oswego to Oosterhout | 5,041.51 mi (8,113.52 km) |
| Lake Oswego to Oosterwolde | 5,000.48 mi (8,047.49 km) |
| Lake Oswego to Oostzaan | 4,997.80 mi (8,043.18 km) |
| Lake Oswego to Opmeer | 4,984.48 mi (8,021.74 km) |
| Lake Oswego to Oss | 5,050.91 mi (8,128.65 km) |
| Lake Oswego to Oud-Beijerland | 5,020.35 mi (8,079.47 km) |
| Lake Oswego to Oudenbosch | 5,036.20 mi (8,104.98 km) |
