Resident Population in Okanogan County, WA was 44.94200 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Okanogan County, WA reached a record high of 44.94200 in January of 2024 and a record low of 25.86700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Okanogan County, WA - last updated from the United States Federal Reserve on April of 2026.