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. The city is a commercial hub of Western Connecticut, an outer-ring commuter suburb of New York City, and a historic summer colony within the New York metropolitan area and New England.