Danbury is a city in Fairfield County, Connecticut, United States, located approximately 50 miles northeast of New York City. Danbury's popula…Danbury is a city in Fairfield County, Connecticut, United States, located approximately 50 miles northeast of New York City. Danbury's population as of 2020 was 86,518. It is the third-largest city in Western Connecticut, and the seventh-largest city in Connecticut. Located within the heart of the Housatonic Valley region, the city is a historic commercial hub of western Connecticut, home to many commuters and summer residents from the New York metropolitan area and New England.