Kerby is an unincorporated community in Josephine County, Oregon, United States, north of Cave Junction on U.S. Route 199. Although the current population of the Kerby area reported by the 2010 United States Census is 595, 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.