Resident Population in Rockland County, NY was 340.80700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Rockland County, NY reached a record high of 340.80700 in January of 2023 and a record low of 229.90300 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Rockland County, NY - last updated from the United States Federal Reserve on May of 2024.