West Haven is a city in New Haven County, Connecticut, United States, located on the coast of Long Island Sound. The city is part of the South Central Connecticut Planning Region. At the 2020 census, the population of the city was 55,584.

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.