Fairfield County is a county in the southwestern corner of the U.S. state of Connecticut, as well as its fastest-growing from 2010 to 2018 and largest in terms of population. As of the 2010 census, the county's population was 916,829, estimated to have increased by 3.6% to 949,921 in 2017, and decreased to 943,332 in 2019. The most populous county in the state, the county population represents a little over 25% of Connecticut's overall population and is one of its fastest-growing counties.
