Resident Population in Monterey County, CA was 436.25100 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Monterey County, CA reached a record high of 440.50600 in January of 2020 and a record low of 247.45000 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Monterey County, CA - last updated from the United States Federal Reserve on April of 2026.