Resident Population in Litchfield County, CT was 185.00000 Thous. of Persons in January of 2021, according to the United States Federal Reserve. Historically, Resident Population in Litchfield County, CT reached a record high of 189.76200 in January of 2010 and a record low of 144.09100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Litchfield County, CT - last updated from the United States Federal Reserve on May of 2024.