what county is winchester, ca in
Winchester is a census-designated place (CDP) in Riverside County, California, USA. As of the 2010 census, the CDP had a total population of 2,534, up from 2,155 at the 2000 census. Winchester was founded in 1886 in Pleasant Valley in what was then San Diego County. The town was named after the widow of Horace Winchester, Mrs. Amy Winchester.