Resident Population in Mariposa County, CA was 16.91900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Mariposa County, CA reached a record high of 18.30200 in January of 2010 and a record low of 6.01500 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Mariposa County, CA - last updated from the United States Federal Reserve on May of 2024.