Resident Population in Los Angeles County, CA was 9663.34500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Los Angeles County, CA reached a record high of 10094.86500 in January of 2016 and a record low of 7040.40000 in January of 1973. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Los Angeles County, CA - last updated from the United States Federal Reserve on May of 2024.