Resident Population in Glenn County, CA was 28.12900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Glenn County, CA reached a record high of 28.89600 in January of 2020 and a record low of 17.40000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Glenn County, CA - last updated from the United States Federal Reserve on May of 2024.