Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. As of the 2000 census, it is the fifth most populous unincorporated area in California, and the twenty-third in the United States. The population was 61,388 at the 2010 census.
Lake Chabot lies at the north of Castro Valley. Directly to the west is San Leandro. Hayward is to the south. To the east, the closest cities are San Ramon, Dublin and Pleasanton. The San Leandro Hills extend along the northeastern edge of the community. The eastern hills of Castro Valley constitute the headwaters of the San Lorenzo Creek watershed and the origin of several creeks that flow into San Lorenzo Creek: Bolinas, Castro Valley, Chabot, Crow, Cull, Eden, Hollis, Kelly Canyon, Norris, and Palomares creeks.
Castro Valley is one of the sites where Joseph Eichler built some of the 10,000 or so homes he built in the Bay Area. Castro Valley has a one-screen movie theater, the Chabot Cinema. The Castro Village complex on Castro Valley Boulevard is widely considered the commercial center of town. The Harry Rowell Rodeo Ranch is located in Castro Valley, and is managed by the Hayward Area Recreation and Park District. Rodeos are held there regularly.
First public school in Castro Valley
The first public school in Castro Valley is a designated California Historical Landmark. A plaque is placed at the original site. The one-room schoolhouse was donated for “educational purposes only,” by Josiah Grover Brickell in 1866. Brickell provided the salary for the first teacher. During the day the teacher taught children and in the evening they taught farmhands. The school burnt down in 1901. It was rebuilt and burned down again in 1920. A new school was built on another property.