Resident Population in Crook County, WY was 7.77500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Crook County, WY reached a record high of 7.77500 in January of 2024 and a record low of 4.50000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Crook County, WY - last updated from the United States Federal Reserve on April of 2026.