As of 2010, how many people lived in the region in which Robert Sheffey was a preacher to?
Robert Sheffey: Robert Sayers Sheffey (July 4, 1820 – August 30, 1902) was a Methodist evangelist and circuit-riding preacher, renowned for his eccentricities and power in prayer, who ministered to, and became part of the folklore of, the Appalachian region of southwest Virginia, southern West Virginia and eastern Tennessee. Appalachia:  As of the 2010 United States Census, the region was home to approximately 25 million people.
25 million people