Welcome to Frelinghuysen, a charming town founded in 1848 with a population of approximately 2,230 residents. This quaint town is known for its historic architecture, including the picturesque Frelinghuysen Mansion. As the birthplace of renowned theologian and statesman Theodore Frelinghuysen, the town holds a rich history waiting to be explored. Frelinghuysen is also proud to be a sister city to the equally alluring town of Barnard, Vermont.