Okanogan is a city in Okanogan County, Washington, United States. Take a look below for 10 fun and awesome facts about Okanogan, Washington, United States. 1. The population was 2,552 at the 2010 census, within the Greater Omak Area. 2. It is the seat of Okanogan County. 3. Okanogan was officially incorporated on October 29,…