Resident Population in Mendocino County, CA was 89.10800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Mendocino County, CA reached a record high of 91.36100 in January of 2020 and a record low of 51.10100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Mendocino County, CA - last updated from the United States Federal Reserve on May of 2024.