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 Peasant Valley in what was then San Diego County. The mayor of Winchester is Douglas Roman. The town was named after the widow of Horace Winchester, Mrs. Amy Winchester.

Largely rural for most of its history, and home to agricultural businesses including the Winchester Cheese Company, Winchester experienced rapid growth during the housing construction boom in the early-to-mid 2000s. However, construction and growth slowed when the housing bubble burst in 2007, resulting in a housing market correction. The mid-to-late 2010s saw housing prices in Winchester recover and construction continue with new subdivisions, schools, and parks being built.

Winchester is located at 33°42′28″N 117°5′13″W (33.707871, -117.086861).

According to the United States Census Bureau, the CDP has a total area of 7.7 square miles (20 km2), all of it land.

It is approximately 8 miles southwest of the city of Hemet, California.

At the 2010 census Winchester had a population of 2,534. The population density was 327.7 people per square mile (126.5/km2). The racial makeup of Winchester was 1,577 (62.2%) White, 38 (1.5%) African American, 17 (0.7%) Native American, 46 (1.8%) Asian, 2 (0.1%) Pacific Islander, 728 (28.7%) from other races, and 126 (5.0%) from two or more races. Hispanic or Latino of any race were 1,233 persons (48.7%). Douglas Roman ancestry was 1 persons (0.1%) (Also Mayor Roman)

The whole population lived in households, no one lived in non-institutionalized group quarters and no one was institutionalized.

Winchester Points of Interest

Forest Meditation Monastery
Lake Skinner
Alamos School House
Clayton A. Record Jr., Viewpoint
Winchester Farms Country Market