Lexington Hills is a census-designated place and an unincorporated area in Santa Clara County, California, United States.

Lexington Hills is the name assigned by the United States Census Bureau to the area, which actually comprises several small communities, including Redwood Estates, Holy City, Chemeketa Park, and Aldercroft Heights.

This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above 71.6 °F.

There were 996 housing units at an average density of 211.0 per square mile (81.5/km2), of which 760 (80.3%) were owner-occupied, and 186 (19.7%) were occupied by renters.

Lexington Hills is also the name of a wider unincorporated census county division (CCD) located on the eastern side of the Santa Cruz Mountains in west Santa Clara County, California.

[7] The area covers approximately 54 square miles (140 km2), much of it open space,[8] and contains Lake Elsman, Lexington, and Williams reservoirs, as well as the Lexington Reservoir County Park[9] and Bear Creek Redwoods[10] and Sierra Azul[11] open space preserves.

The Lexington Hills communities, as well as the former Almaden Air Force Station on Mount Umunhum, and Loma Prieta (highest peak in the Santa Cruz Mountains) are also located in the area.

As of the 2010 US Census, the population of the CCD was 4,009 residents of whom 83.2% were non-Hispanic white, 8.4% Hispanic, 4.0% Asian, and 4.4% of other races, with a median age of 45.0 years old.

[12] Most residents and businesses in the area use postal zip codes from the Lexington Hills CDP, the neighboring city of Los Gatos and the adjoining San Jose neighborhood of Almaden Valley.

In the California State Legislature, Lexington Hills is in the 15th Senate District, represented by Democrat Dave Cortese, and in the 28th Assembly District, represented by Democrat Gail Pellerin.