Resident Population in Orange County, CA was 3170.43500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Orange County, CA reached a record high of 3186.26100 in January of 2020 and a record low of 1421.23300 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Orange County, CA - last updated from the United States Federal Reserve on April of 2026.