• 510 Area Code 

    The CPUC will begin the process to introduce a new area code to the area now served by the 510 area code, as the 510 is expected to use up its available prefixes by June 2019.  The telecommunications service providers have proposed to introduce the new area code through the overlay method.  Adding a new area code to the area now served by the 510 area code will provide additional prefixes and new telephone numbers for the 510 customers.  The proposed overlay, pending CPUC approval, will allow all customers to keep their current phone numbers, including their area code.  Customers will not be required to change their phone numbers or their area code.  To avoid service disruption, the new area code will be added to the 510 area code by December 2017, six months before depletion of prefixes.  In December 2017, customers requesting new phone numbers in the 510 geographic area may be assigned a new area code.

    The area served by the 510 area code includes the western portions of Alameda and Contra Costa Counties. The 510 area code serves the cities of Alameda, Albany, Berkeley, Emeryville, Fremont, Hayward, Newark, Oakland, Piedmont, San Leandro and Union City in Alameda County; and the cities of El Cerrito, Hercules, Pinole, Richmond, and San Pablo in Contra Costa County.

    The CPUC will be holding local jurisdiction and public meetings on January 17 and February 15, 2017, to inform the local jurisdictions and the public, and to hear concerns about adding a new area code to the 510 area code. 

    Local Jurisdiction and Public Meetings 




    1 p.m., January 17, 2017 

    5:30 p.m., January 17, 2017 

    2 p.m., February 15, 2017 

    Elihu Harris State Building
    1515 Clay Street
    2nd Floor, Room 11
    Oakland, CA

    Berkeley Central Library
    3rd Floor, Community Meeting Room
    2090 Kittredge Street
    Berkeley, CA

    Hayward City Council Chambers
    777 B Street, 2nd Floor
    Hayward, CA


    The CPUC welcomes your participation and comments. If you are unable to attend these meetings, you may submit written comments to the CPUC Public Advisor's Office:

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