Alhambra Valley (/ɑːlˈhɑːmbrə/ ⓘ, Spanish: [aˈlambɾa]) is a census-designated place in the Briones Hills of central Contra Costa County, California.

[2] The 2010 United States census reported that Alhambra Valley's population was 924.

[3] According to the United States Census Bureau, the CDP has a total area of 2.155 square miles (5.581 km2), all of it land.

Alhambra Valley first appeared as a census designated place in the 2010 U.S.

There were 375 housing units at an average density of 174.0 per square mile (67.2/km2), of which 360 were occupied, 328 (91.1%) by the owners and 32 (8.9%) by renters.