Resident Population in Fresno County, CA was 1024.12500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Fresno County, CA reached a record high of 1024.12500 in January of 2024 and a record low of 413.32900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Fresno County, CA - last updated from the United States Federal Reserve on September of 2025.