Resident Population in Ventura County, CA was 829.59000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Ventura County, CA reached a record high of 848.26400 in January of 2017 and a record low of 378.49700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Ventura County, CA - last updated from the United States Federal Reserve on May of 2024.