Resident Population in Merced County, CA was 291.92000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Merced County, CA reached a record high of 291.92000 in January of 2023 and a record low of 104.62900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Merced County, CA - last updated from the United States Federal Reserve on May of 2024.