Area Code Atlas

NPA 818 split from 213

Area code 818 was created in 1983 from a geographic split of area code 213, dividing the Los Angeles region to provide additional numbering resources for the San Fernando Valley and surrounding communities.

NPA 818 split from 213

In 1984, area code 818 was created from a split of 213, serving the San Fernando Valley and the San Gabriel Valley. This event marked one of the first major instances of a U.S. city, Los Angeles, being split into two numbering plan areas.

NPA 818 split from 213

Area code 818 was created in a split from area code 213 on January 7, 1984, to serve the San Fernando Valley region as Los Angeles County's population and telecommunications demand increased.

NANP-Split of 818 (California) Numbering Plan Area (NPA)

NPA 626 split from 818

Area code 626 was created from a split of 818 on June 14, 1997, providing a separate numbering plan area for most of the San Gabriel Valley. The split was necessary due to continued growth in demand for telephone numbers as part of ongoing relief for the growing Los Angeles metropolitan region.

Extraordinary Jeopardy Procedures for 818 NPA in California

CPUC decision to overlay 747 on 818

The California Public Utilities Commission decided on April 24, 2008, that area code 747 would overlay area code 818. This decision was made to address the exhaustion of available numbers in the region, with the overlay scheduled to take effect in 2009, allowing existing customers to retain their numbers.

NPA 747 overlay on 818 announced

NPA 747 to Overlay NPA 818 (California)

Permissive dialing period for 818/747 overlay

A permissive dialing period began on October 11, 2008, for the 818/747 overlay, allowing both seven-digit and ten-digit dialing as customers adjusted to the new overlay arrangement.

Mandatory ten-digit dialing for 818/747 overlay

By mid-April 2009, all calls within the 818/747 overlay area required dialing the area code plus the number, ending the permissive dialing period and enforcing mandatory ten-digit dialing.

Mandatory ten-digit dialing for 818/747 overlay

Mandatory ten-digit dialing was implemented for the 818 and 747 area codes on April 18, 2009. After this date, calls dialed without the area code would not be completed, reflecting the transition to an overlay complex.

NPA 747 overlays 818

Area code 747 was overlaid on area code 818 effective May 18, 2009, providing additional numbering resources for the San Fernando Valley region. New telephone lines and services could be assigned numbers with the 747 area code from this date.

Mandatory ten-digit dialing begins for 818/747 overlay

Mandatory ten-digit dialing began on May 18, 2009, for all calls within the overlay complex of area codes 818 and 747 in the San Fernando Valley. This change was required to accommodate the overlay and ensure proper call routing.