Resident Population in Alameda County, CA was 1649.06000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Alameda County, CA reached a record high of 1680.61400 in January of 2020 and a record low of 1071.44600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Alameda County, CA - last updated from the United States Federal Reserve on April of 2026.