In February 1797, a new Episcopal church was organized at a meeting in the home of Dr. Samuel Sanford in Seymour. By spring, the cornerstone for a church building had been laid but, due to a lack of funds, Union Church was only completed in 1816. Rev. Richard Mansfield served as the part-time rector until 1802. The church grew over the years and, in 1853, its name was changed to Trinity Episcopal. In 1857, the church was almost completely rebuilt, starting with only the old framework of the building, under the direction of architect Henry Austin of New Haven. There have been changes to the church over the years. The current spire is not as tall or complex than the one Austin originally built. At one time, the church also had Victorian-style ornamentation inside, but in 1997, when the church celebrated its 200th anniversary, the interior was completely renovated in the Colonial Revival manner.