Resident Population in Adams County, ID was 4.90300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Adams County, ID reached a record high of 4.90300 in January of 2023 and a record low of 2.87700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Adams County, ID - last updated from the United States Federal Reserve on May of 2024.