The Union Episcopal Church in West Claremont was built in 1773, and is the oldest surviving Episcopal church building in New Hampshire and the state's oldest surviving building built exclusively for religious purposes. The parish was organized in 1771 and chartered by the New Hampshire legislature in 1794 as Union Church Parish. Located across the street, Old St. Mary's Church, built in 1823 mostly in the Federalist style, was the first Roman Catholic church in New Hampshire. It was discontinued in 1870 in favor of the new St. Mary's Church in the Lower Village District.