760/442 Area Code


On October 16, 2008, the California Public Utilities Commission (CPUC) approved an overlay in Decision 08-10-038 to accommodate the need for additional telephone numbers in the 760 area code region. On November 21, 2009, the overlay became effective and the new 442 area code was overlaid onto the 760 area code.

All calls made from 760 or 442 numbers must be dialed as 1 + area code + 7-digit telephone number. Cellphone callers who have service with certain cell service providers may be able to complete calls without dialing “1” before the area code. The price of a call did not change due to the overlay, as calling areas and rates remained the same. Calls to 911, as well as 211, 311, 411, 511, 611, 711 and 811 were not affected by the overlay, and continue to be dialed with 3 digits.


The 760 area code was created when it was split from the 619 area code in 1997. On July 8, 1999, the CPUC issued D.99-07-017, ordering a geographic split of the 760 area code to introduce the 442 area code. On July 20, 2000, the CPUC subsequently suspended the split plan in D.00-07-053 to consider number conservation as a means to extend the life of the 760 area code. In 2006, the 760 area code was in jeopardy of exhaust due to high demand for telephone numbers. Thus, on June 18, 2007, the North American Numbering Plan Administrator (NANPA) filed Application 07-06-018, requesting the CPUC to approve an overlay as relief for the 760 area code. On April 24, 2008, the CPUC issued D.08-04-058, denying NANPA’s request for an overlay and approving a split for the 760 area code. On August 15, 2008, parties in Northern San Diego County filed a petition to replace the previously approved geographic split with an overlay. On October 16, 2008, the CPUC granted the petition by issuing D.08-10-038, ordering an overlay for the 760 area code. The overlay was effective on November 21, 2009, adding the 442 to the 760 area code.

Today, the 760 and the 442 area codes serve the area in the far southeastern part of California, extending from Inyo and Mono County east of the Sierras to the Nevada and Arizona borders, south to the Mexico border, and west to northern San Diego County. At 46,666 square miles, the 760/442 overlay territory is equal to 29% or nearly one third of California. It is geographically the largest area code within California.

Map of the 760/442 area code territory

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