Fairfield County is the most southwestern and populous county of the U.S. state of Connecticut. As of the 2010 census, the county's population was 916,829, estimated to have increased by 2.9% to 944,177 in 2016. The county population represents a little over 25% of Connecticut's overall state population and is one of the fastest growing counties in the state.  The county contains four of the state's largest cities (Bridgeport (1st), Stamford (3rd), Norwalk (6th) and Danbury (7th)), whose combined population of 433,368 is almost half the county's.
The United States Office of Management and Budget has designated Fairfield County as the Bridgeport-Stamford-Norwalk, CT Metropolitan Statistical Area. The United States Census Bureau ranked the Bridgeport-Stamford-Norwalk, CT Metropolitan Statistical Area as the 57th most populous metropolitan statistical area of the United States as of July 1, 2012. The Office of Management and Budget has further designated the Bridgeport-Stamford-Norwalk, CT Metropolitan Statistical Area as a component of the more extensive New York-Newark-Bridgeport, NY-NJ-CT-PA Combined Statistical Area, the most populous combined statistical areaand primary statistical area of the United States.
As is the case with all eight of Connecticut's counties, there is no county government and no county seat. As an area, it is only a geographical point of reference. In Connecticut, the cities and towns are responsible for all local governmental activities including fire and rescue, schools, and snow removal; in a few cases, neighboring towns will share certain resources.
Fairfield County's Gold Coast helped rank it sixth in the US in per-capita personal income by the Bureau of Economic Analysis in 2005, contributing substantially to Connecticut being one of the most affluent states in the US. Other communities are more densely populated and economically diverse than the affluent areas for which the county is better known.
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