Wallingford is a town in New Haven County, Connecticut, United States, centrally located between New Haven and Hartford, and Boston and New York City. The town is part of the South Central Connecticut Planning Region. The population was 44,396 at the 2020 census. The community was named after Wallingford, in England.

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.