Madison is a town in the southeastern corner of New Haven County, Connecticut, United States, occupying a central location on Connecticut's Long Island Sound shoreline. The town is part of the South Central Connecticut Planning Region. The population was 17,691 at the 2020 census.

New Haven County is a county in the south central part of the U.S. state of Connecticut. As of the 2020 census, the population was 864,835, making it the third-most populous county in Connecticut. Two of the state's top 5 largest cities, New Haven (3rd) and Waterbury (5th), are part of New Haven County.