Resident Population in Barnstable County, MA was 231.73500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Barnstable County, MA reached a record high of 232.59400 in January of 2021 and a record low of 96.65600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Barnstable County, MA - last updated from the United States Federal Reserve on May of 2024.