Area codes 909 and 840
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 prior to 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 will be overlaid with area code 840 on February 23, 2021. Come late July 2020, permissive calling will start.
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 pulse dialers (due to the excessive time required for each spin of the dial to return 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. Area code 909 also has the distinction of being 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 codesEdit
Los Angeles CountyEdit
- Diamond Bar
- Glendora (mostly in the 626 area code)
- City of Industry (mostly in the 626 area code and small portion in the 562 area code)
- La Verne
- Rowland Heights (also in the 626 area code and small portion in the 562 area code)
- San Dimas
- Walnut (small portion in the 626 area code)
- West Covina (mostly in the 626 area code)
San Bernardino CountyEdit
- Big Bear City
- Big Bear Lake
- Blue Jay
- Chino Hills (small portion in the 657/714 area code)
- Grand Terrace
- Lake Arrowhead
- Loma Linda
- Lytle Creek
- Rancho Cucamonga
- Running Springs
- San Antonio Heights
- San Bernardino
- "NANPA Planning Letter 529" (PDF). 2019-07-23.
|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|
|West: 626||area codes 840 and 909||East: 442/760|
|South: 951, 657/714|