The Gold Coast, also known as Lower Fairfield County or Southwestern Connecticut not limited to the Connecticut panhandle, is an affluent part of Western Connecticut that includes the entire southern portion of Fairfield County as defined by the U.S. Census Bureau, Super-Public Use Microdata Area (Super-PUMA) Region 09600. The area is about 50 miles (80 km) northeast of New York City, and is home to many wealthy Manhattan business executives. Parts of the region are served by the Western Connecticut Council of Governments.

Fairfield County is a county in the southwestern corner of the U.S. state of Connecticut. It is the most populous county in the state and was also its fastest-growing from 2010 to 2020. As of the 2020 census, the county's population was 957,419, representing 26.6% of Connecticut's overall population. The closest to the center of the New York metropolitan area, the county contains four of the state's top 7 largest cities—Bridgeport (1st), Stamford (2nd), Norwalk (6th), and Danbury (7th)—whose combined population of 433,368 is nearly half the county's total population.