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Within area code 510, Castro Valley is located in Alameda County, California. This area is one of the most populated communities in the state. This valley is named after Don Guillermo Castro who was a famous Californian ranchero and landowner in the area now known as Castro Valley.
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The 510 covers California, USA and includes Castro Valley, and includes Union City, Oakland, Richmond, San Leandro, San Lorenzo, and San Pablo. This area code 510 uses the North American Numbering Plan format. The NANP format is a telephone numbering system used by the United States, Canada, and some Caribbean nations. Telephone numbers under the NANP use the following dialing format: +1 country code followed by a three digit area code and seven digit local number. For a 510 local number, check out Hushed!
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