Kerby is an unincorporated community and census-designated place (CDP) in Josephine County, Oregon, United States, north of Cave Junction on U.S. Route 199. As of the 2020 census, Kerby had a population of 628. Despite its population and numerous businesses, it is often listed in tourist guides as a ghost town, because of the number of historic buildings left from its days as a gold-mining town. Kerby came into existence between 1854 and 1857.