Resident Population in Worcester County, MA was 881.24800 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Worcester County, MA reached a record high of 881.24800 in January of 2024 and a record low of 637.03700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Worcester County, MA - last updated from the United States Federal Reserve on April of 2026.