In addition to these four Presbyterian Churches of Canonsburg, there was a Reformed Presbyterian congregation for a while in the early part of the nineteenth century. Adherents of this branch of Presbyterianism were called Covenenters, and there were a number of them in Washington County, particularly in the neighborhood of Canonsburg.

The Covenenters organized a congregation about 1808 and built a log church on the northwest corner of the intersection of Pitt Street and North Central Avenue. The church called the Rev. David Graham, a 30-year old native of Ireland who acted as stated supply for two years. He then left the ministry and became a lawyer in New York City. Rev. William Gibson was installed as pastor in 1817. He also was a native of Ireland, having been born in County Down in 1753, and had come to the United States in 1797. His emigration from Ireland may have been precipitous, as he was said to have been a member of the United Irishman, an outlawed organization that staged an uprising against the English in 1798. Though well into his sixties, Gibson remained as pastor of the Canonsburg church for nearly 13 years, serving an extensive field, before returning East.

In 1821, during Rev. Gibson’s pastorate, the lot where the church and cemetery were located were purchased by the church board of trustees. Following Gibson’s resignation, the Covenenters called Rev. Gordon T. Ewing, also a native of Ireland. He urged the congregation to tear down the old log building and put up a more imposing structure. The project was completed as far as the tearing down when the pastor’s health failed. He returned to Ireland after two years as the pastor in Canonsburg.

The church building was not rebuilt. About two years later, in 1834, the trustees sold the lot, including the cemetery. In the 1870s several gravestones were still in place. Their dates ranged from 1822 to 1837, though the latter date was after the property was sold. A deed locates the graveyard some 650 feet west of North Central Avenue, which would place it near the entrance to Town Park. It extended about 150 feet along Pitt Street and was 80 feet deep.