Fairfield County is an affluent county in the southwestern corner of the U.S. state of Connecticut. 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. The closest to New York City, 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 nearly half the county's total population.
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.