Resident Population in Essex County, MA was 810.08900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Essex County, MA reached a record high of 810.08900 in January of 2023 and a record low of 625.90000 in January of 1977. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Essex County, MA - last updated from the United States Federal Reserve on May of 2024.