415/628 Area Code


On December 19, 2013, the CPUC approved an overlay that will add the new 628 Area Code to the 415 Area Code region. Under the overlay plan, current 415 Area Code customers can keep their numbers, but as of February 21, 2015, all calls made from the 415 Area Code will have to be dialed using 1 + area code + 7-digit telephone number. This means that all calls in the 415 Area Code that are currently dialed with 7 digits will need to be dialed using 1 + area code + 7-digit telephone number.

Starting August 16, 2014, customers in the 415 Area Code may begin dialing 1 + area code + telephone number when placing calls. If customers forget and use the old dialing procedure of dialing just seven digits, calls will still be completed until February 21, 2015.

Beginning February 21, 2015, callers must use the new 1 + 10-digit dialing procedure for all calls. After that date, if customers do not use the new dialing procedure, their calls will not be completed and a recording will instruct them to hang up and dial again. Between August 16, 2014 and February 21, 2015, customers should practice using the new procedure whenever they place calls from the 415 Area Code.

Beginning March 21, 2015, new telephone lines or services may be assigned numbers using the 628 area code.

The overlay will primarily affect the County of San Francisco, most of Marin County and a small portion of San Mateo County, as shown on the Overlay Map. The communities that will be affected are Belvedere, Brisbane, Corte Madera, Daly City, Fairfax, Ignacio, Inverness, larkspur, Mill Valley, Nicasio, Novato, Point Reyes.

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On May 24, 2013, the North American Numbering Plan Administrator (NANPA) filed an application for a new area code, because all of the available three-digit central office prefixes in the 415 Area Code were expected to be assigned by the 3rd quarter of 2015. In response, the CPUC opened proceeding A1305013 to consider the NANPA’s application.


The CPUC invited public comments through proceeding filings and a Commission web portal. Public meetings were held on January 16 and 17, 2013 in San Francisco and San Rafael, respectively. Options for introducing the new 628 Area Code – overlay or geographic split – were discussed. Attendees asked questions and provided inputs. In particular, alarm companies and public safety answering points (911) representatives spoke out favoring an overlay.


The Commission adopted Decision D.13-12-055 and approved the overlay option on December 19, 2013.


D.13-12-055 also required telephone companies that provide local service in the 415 Area Code to implement and fund a program to inform the affected public about the changes, especially the new dialing procedure. Notifications that were provided to customers as well as materials that were presented at the public meetings are available below.


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