Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Middlesex County, CT was 135257.00000 Persons in January of 2021, according to the United States Federal Reserve. Historically, Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Middlesex County, CT reached a record high of 143912.00000 in January of 2009 and a record low of 135257.00000 in January of 2021. Trading Economics provides the current actual value, an historical data chart and related indicators for Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Middlesex County, CT - last updated from the United States Federal Reserve on May of 2024.