Resident Population in Pierce County, WA was 941.17000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Pierce County, WA reached a record high of 941.17000 in January of 2024 and a record low of 396.00000 in January of 1973. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Pierce County, WA - last updated from the United States Federal Reserve on April of 2026.