In the early nineteenth century, the First Parish Church in Waltham became a Unitarian church. The Second Religious Society of Waltham was established in 1820. Its meeting house was called the “Factory Church” because its membership was primarily made up of people connected with the Boston Manufacturing Company, which provided the funds for the building. This Society also leaned towards Unitarian views (it later united with the First Parish in 1839) and those with Trinitarian beliefs left to form the Trinitarian Congregational Church. The congregation erected a church building on the corner of Main and Heard Streets in 1826. The current church building, at 726 Main Street, was built in 1870. The organization of the church was changed in 1906, when it incorporated itself as the First Congregational Church of Waltham. It became a member of the United Church of Christ in 1957, but withdrew in 2006 to become an independent, trans-denominational congregation called Trinity Church.