Resident Population in Valley County, ID was 12.64400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Valley County, ID reached a record high of 12.64400 in January of 2023 and a record low of 3.60900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Valley County, ID - last updated from the United States Federal Reserve on May of 2024.