Resident Population in Custer County, CO was 5.53400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Custer County, CO reached a record high of 5.53400 in January of 2023 and a record low of 1.10000 in January of 1973. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Custer County, CO - last updated from the United States Federal Reserve on May of 2024.