Resident Population in Custer County, ID was 4.52300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Custer County, ID reached a record high of 5.52200 in January of 1983 and a record low of 2.96700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Custer County, ID - last updated from the United States Federal Reserve on May of 2024.