The town of Wallingford was established in 1670 in unincorporated area north of New Haven and formally added to New Haven County in 1671 .
As established in 1666 , New Haven County consisted of the towns of Milford , New Haven , and Guilford .
The town of Wallingford was established in 1670 in unincorporated area north of New Haven   and formally added to New Haven     in 1671 .
As established in 1666 , New Haven County consisted of the towns of Milford , New Haven , and Guilford .