Cornville is a unincorporated community in Yavapai County, Arizona, United States. The population as of the 2010 United States Census was 3,280, down from 3,335 at the 2000 census. For statistical purposes, the United States Census Bureau has defined Cornville as a census-designated place that includes the communities of Cornville and Pag…Cornville is a unincorporated community in Yavapai County, Arizona, United States. The population as of the 2010 United States Census was 3,280, down from 3,335 at the 2000 census. For statistical purposes, the United States Census Bureau has defined Cornville as a census-designated place that includes the communities of Cornville and Page Springs.