Wilseyville is an unincorporated community in Calaveras County, California. It lies at an elevation of 2769 feet. Wilseyville is notorious for the ranch owned by Leonard Lake which was used in his serial killings, and used to dispose of the bodies of his victims. Wilseyville's post office was established in 1947; it has the zip code 95257. Wilseyville was named after Lawrence A. Wilsey, an executive at the Forest Products Company.