Resident Population in New London County, CT was 268.80500 Thous. of Persons in January of 2021, according to the United States Federal Reserve. Historically, Resident Population in New London County, CT reached a record high of 274.17300 in January of 2012 and a record low of 230.65400 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in New London County, CT - last updated from the United States Federal Reserve on May of 2024.