Kerby is an unincorporated community and census-designated place in Josephine County, Oregon, United States, north of Cave Junction on U.S. Route 199. As of the 2010 census the population was 595. 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.