City · United States

Castro Valley

Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. At the 2020 census, it was the fourth most populous unincorporated area in California. The population was 66,441 at the 2020 census.

Good to know

• Population: 61,388.
• Area: 4.382e+07 sq km.
• Elevation: 50 m.
• Timezone: America/Los_Angeles.

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