Resident Population in Monterey County, CA was 430.72300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Monterey County, CA reached a record high of 438.39000 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 May of 2024.