An Episcopal Society comprising Branford, Guilford and New Haven was established in 1748, but it was not until 1784 that Episcopalians in Branford legally organized Trinity Parish and erected a church, completed in 1786. This original church, a wooden structure without a steeple, was used until a new church was constructed just southeast of the old one. The cornerstone was laid in April 1851 and the church was consecrated by Bishop Brownell on January 27, 1852. Trinity Episcopal Church was designed in the English Gothic style by Sidney Mason Stone of New Haven. Some of the church‘s original exterior decorative elements were removed over the years. In 1920, the outside walls were covered with white stucco as a protection. The stucco was replaced with long leafed southern pine in 1944. A parish hall was added next to the church in 1916. It served as an infirmary during the great influenza epidemic of 1918.