Salesville is a census-designated place and former village in Guernsey County, Ohio, United States. As of the 2020 census, the population was 123, down from 129 at the 2010 census. Its residents voted for dissolution in 2016.

Guernsey County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 38,438. Its county seat and largest city is Cambridge. It is named for the Isle of Guernsey in the English Channel, from which many of the county's early settlers emigrated.