The congregation of the Port Carling United Church began in 1869 when locals began to gather for prayer meetings in the homes of Michael Bailey and Patrick O'Beirne, two prominent residents. In 1872, the
Crown granted the current lot of land to the congregation for the construction of a church. It took five years to raise funds for the materials needed to construct the church. In 1877, the congregation came together to build a structure. Prominent members of the community like Patrick O'Beirne and William Hanna donated church necessities such as the organ and the stained glass windows. Church services began the following year. This church's denomination was originally Methodist, but in 1925, the Methodist Church merged with
other denominations to become the United Church of Canada. Since its establishment, the minister of this church was required to preach at six different local churches each week, travelling on foot, by horse, by
boat, or by car in later years, until 1970 when they amalgamated.

Port Carling United Church is a rectangular wood frame vernacular construction with clapboard siding, a steep pitched front gable roof, and entrance offset to the left with an arched transom and wood door with iron hinges. The south elevation has four arched lancet windows fitted with stained glass, rectangular basement windows, and a basement entrance at the west end of the elevation complete with a small gabled portico. The centre of the west elevation contains a gothic window. Hanna Hall, the additional wood structure on the north elevation, was a later extension to the church for events. The cupola was a 2008 addition.