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History · Castro Valley

The history of Castro Valley

Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. We’re gathering its old postcards, photos and papers from public archives right now.

Photo: Lights and freedom

Castro Valley through the years

Every find lands on the timeline as it comes in. Gaps show where the archives go quiet, and where neighbors can help.

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Castro Valley

California · CA
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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/19 · 2025-01-01
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