Okanogan County, Washington, is located in the eastern part of the state, far from any active volcanoes. The closest active volcano to Okanogan County is Mount St. Helens, which is located about 200 miles to the southwest.

However, it's important to note that there are numerous dormant or extinct volcanoes in the Cascade Range, which extends through Washington state. While not currently erupting, these volcanoes still pose a potential risk in the future.