Resident Population in Owyhee County, ID was 12.74800 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Owyhee County, ID reached a record high of 12.76200 in January of 2023 and a record low of 6.42200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Owyhee County, ID - last updated from the United States Federal Reserve on April of 2026.