Tonasket is a city in Okanogan County, Washington, United States. The population was 1,032 at the 2010 census. Take a look below for 15 fascinating and fun facts about Tonasket, Washington, United States. 1. Tonasket was officially incorporated on December 16, 1927. 2. It is named after Chief Tonasket of the Okanogan people, a local…