Area Code Atlas

NANP- Split of 760 Numbering Plan Area (NPA) with 442 NPA - California

NPA 760 Split, Creating NPA 442 (California)

NPA 442 overlay on 760 announced

NPA 442 to Overlay NPA 760 (California)

NPA 442 added as overlay to 760

Area code 442 was added as an overlay to area code 760 in California, starting service on November 21, 2009, to address number exhaustion issues in the region. This overlay was implemented after the California Public Utilities Commission determined that an overlay was preferable to a geographic split, providing additional numbering resources and requiring ten-digit dialing for all calls within the region.

Mandatory ten-digit dialing in 760/442 overlay complex

Mandatory ten-digit dialing was implemented in the 760/442 overlay complex on November 21, 2009, requiring all users to dial the area code even for local calls.