Area Code Atlas

NPA 909 split from 714

Area code 909 was created in 1992 from a split of 714, serving eastern Los Angeles County and the Inland Empire. This further reduced the geographic area covered by 714.

NPA 909 split from 714

Area code 909 was assigned on November 14, 1992, as a split from area code 714. The new code served the majority of Riverside, San Bernardino, Ontario, and Pomona, in the Inland Empire region of California.

UPDATED INFORMATION ON THE GEORGIA 404/706 SPLIT AND THE CALIFORNIA 714/909 SPLIT

Mandatory dialing for NPA 909

Mandatory dialing of area code 909 began in August 1993 following an initial permissive dialing period after its creation. Callers were required to use the area code for all calls within the region.

Extraordinary NPA-Specific Jeopardy Conservation Procedures Announced for 909 NPA (California)

NANP- Split of 909 Numbering Plan Area (NPA) with 951 NPA and subsequent Overlay of 909 Numbering Plan Area (NPA) with 752 NPA - California

Suspension of overlay relief for 408 and other NPAs

On December 16, 1999, the California Public Utilities Commission suspended the implementation of planned overlays for area codes 408, 415, 510, 650, 714, and 909. This action was taken due to the adoption of telephone number pooling, which delayed the need for additional area codes.

Overlays Suspended in the 408, 415, 510, 650, 714 & 909 NPAs

909/951 NPA Split Suspended Temporarily (California)

Planned split of 909 to create 951 (cancelled)

A planned split of area code 909 to create 951 for western Riverside County was scheduled for September 9, 2000, but was cancelled due to number conservation measures and public opposition.

Planned overlay of 909 with 752 (cancelled)

An overlay of area code 909 with 752 was planned with an in-service date of February 10, 2001, but was cancelled before implementation.

CPUC approved split of 909 to create 951

The California Public Utilities Commission approved a two-way geographic split of area code 909 on November 13, 2003. The northern region would retain 909, while the southern portion would become area code 951.

909 NPA; 2-way Split, Creating 951 NPA California

NPA 951 split from 909

Area code 951 was created on July 17, 2004, when western Riverside County was split off from area code 909. This split was part of the relief plan originally scheduled in 2000, with some residents in Eastvale and Corona allowed to retain the 909 area code. Area code 752 was returned to the numbering pool and was not used.

Permissive dialing begins for 951 split from 909

Permissive dialing for the new area code 951 began on July 17, 2004, following the split of area code 909. During this period, calls could be completed using either the old or new area code.

CA 909/951 NPA Split-Reminder Planning Letter

Mandatory dialing for 951 and 909 after split

Mandatory dialing of the new area code 951 began on October 30, 2004, ending the permissive period. Callers were required to use the correct area code for numbers in the new 951 region.

Overlay of 909 with 840 approved

The California Public Utilities Commission approved an all-services distributed overlay for the 909 area code with the new 840 area code in June 2019. The overlay was planned to address number exhaustion in the region.

NPA 840 overlay on 909 announced

NPA 840 to Overlay 909 (California)

Overlay relief approved for 909 with 840

The California Public Utilities Commission approved an all-services overlay for area code 909 with the new area code 840 on July 23, 2019. The overlay was planned to address number exhaustion in the 909 region.

Permissive dialing period for 840 overlay

A permissive dialing period was implemented from July 2020 to January 2021 in the 909 numbering plan area to prepare for the overlay of area code 840.

Permissive 1+10-digit dialing for 909/840 overlay complex

Permissive 1+10-digit dialing began on July 25, 2020, for the 909 and 840 overlay complex. During this period, callers could use either 7-digit or 1+10-digit dialing for local calls within the affected area codes.

Mandatory 1+10-digit dialing for 909/840 overlay complex

Mandatory 1+10-digit dialing was implemented on January 23, 2021, for all calls within and between the 909 and 840 area codes. This change was required to accommodate the new overlay and ensure proper call routing.

Overlay of 909 with 840

Area code 840 was added as an overlay to the 909 numbering plan area on February 23, 2021. A permissive dialing period was from July 2020 to January 2021. Existing 909 numbers were retained, and new numbers could be assigned with the 840 code in the same region.