Area codes 909 and 840

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Map of California numbering plan areas (blue) and border states. Area codes 840 and 909 are shown in red.

Area codes 840 and 909 are California telephone area codes that cover far eastern Los Angeles County and southwestern San Bernardino County. The 909 area code was split from area code 714 on November 14, 1992. By August 1993 use of the new area code became mandatory. Western Riverside County was split off from 909 into area code 951 on July 17, 2004. 909 still covers small portions of Corona, Riverside, and Moreno Valley, which are in Riverside County.

Originally on the same date that 951 split off from 909, the area retaining the 909 area code was to be overlaid by a new area code 752. However, as a result of number pooling, this overlay plan was shelved before the 909/951 split, and 752 was returned to the NANPA numbering pool to be assigned at a later date. On July 23, 2019, the California Public Utilities Commission announced that the 909 area code would be overlaid with area code 840 from February 23, 2021. Permissive calling began in July 2020; once the overlay begins, recorded messages will inform callers should they dial incorrectly.[1]

840 is California's 36th area code. When it goes into effect, exactly half of California's 24 geographically-designated area code zones will be overlay areas, while the other 12 will retain single-area code status.

Under the traditional NANPA plan, 909 was the "worst" all-purpose area code for rotary pulse dialers (due to the long time required for the dial to return after each digit before the next digit could be dialed; the only "worse" area code for pulse dialing is the pay-for-service area code 900), in contrast to area codes such as 212 and 213, although it was implemented long after rotary phones fell out of general use. Area code 909 is also the second to last new area code with a 0 as the middle digit to go online. (The rest of the original style area codes afterwards were 905 [which was previously a "dialaround" code for Mexico] and the last of the N10 area codes that were allowed before the format changed in 1995.)

Cities in the 909/840 area codes[edit]

Los Angeles County[edit]

Riverside County[edit]

San Bernardino County[edit]

See also[edit]


  1. ^ "NANPA Planning Letter 529" (PDF). 2019-07-23.

External links[edit]

California area codes: 209, 213/323, 279/916, 310/424, 341/510, 408/669, 415/628, 442/760, 530, 559, 562, 619/858, 626, 650, 657/714, 661, 707, 747/818, 805/820, 831, 840/909, 925, 949, 951
North: 442/760
West: 626 area codes 840 and 909 East: 442/760
South: 951, 657/714

Coordinates: 34°06′N 117°30′W / 34.1°N 117.5°W / 34.1; -117.5