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 and the New York Metropolitan Area. The population was 44,396 at the 2020 census. The community was named after Wallingford, in …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 and the New York Metropolitan Area. The population was 44,396 at the 2020 census. The community was named after Wallingford, in England.