On January 31, 1810, the Ohio government authorized the creation of Guernsey County. Residents named the county after the "Isle of Guernsey."?
Guernsey County is located in eastern Ohio, in the heart of Appalachia. It is predominantly rural, with less than one percent of the county's 522 square miles consisting of urban areas. The county seat is Cambridge, which, in 2000, was the county's largest urban center with a population of 11,520 people. Guernsey County experienced a slight increase in population