Mary E. C. McCoy (b. Cloud) (1851-1921) was born in Northwest Township, Indiana, and died in McLeansboro, Illinois. She moved with her family to McLeansboro sometime before 1860 and attended Ohio Female College in Cincinnati, Ohio, in the early 1870s. In 1878, in McLeansboro, she married Chalon G. McCoy who was a land dealer and real estate agent. She first studied Christian Science in November 1886 with Ellen Brown Linscott and Joseph A. Adams and then took Mary Baker Eddy's Primary course in September 1888. McCoy was a member of First Church of Christ, Scientist, St. Louis, Missouri, and became a member of The First Church of Christ, Scientist, in Boston, Massachusetts on June 7, 1904. She was also a member of the General Association of Teachers and the National Christian Scientist Association. In her will, McCoy left her home, which had been built by her father in 1884, to the city of McLeansboro to be turned into a library dedicated to the memory of her parents.

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