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Area Code for Castro Valley City in Alameda County, California State, USA Area Code Lookup

Castro Valley is a town/City in Alameda County, California in USA . The ZIP codes or postal codes are used within the United States to help the United States Postal Service (USPS) to send or receive mail more efficiently. Following are the Country Codes, Phone Codes, Dialing Codes Area Codes by Zip codes used in theCastro Valley, Alameda County, California, Usa. Following List of Area codes / Dialing Codes by ZIP Codes in Castro Valley, Alameda County, California Castro Valley, Alameda County, California, Usa
SL No. Zip Code City County State Country Area Code
1 94546 Castro Valley Alameda County California Usa 510
2 94552 Castro Valley Alameda County California Usa 510
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