{{short description|Area code in central and southern California, United States}} {{Use mdy dates|date=February 2026}} {{Use American English|date=February 2026}} {{California area codes image map|661}}

'''Area code 661''' is a telephone area code in the North American Numbering Plan (NANP) in the U.S. state of California. The numbering plan area comprises the southern part of the San Joaquin Valley and the far northern part of the Los Angeles metropolitan area. The largest cities in the area are Bakersfield, Santa Clarita, Palmdale, and Lancaster.

The area code was created in an area code split of numbering plan area 805 on February 13, 1999, in which the eastern part of 805 was renumbered with the new area code.<ref>{{cite web |url=https://www.nanpa.com/sites/default/files/planning_letters/PL-111.pdf |title=Planning Letter 111: NANP-Split of 805 (California) Numbering Plan Area (NPA) |publisher=NANPA |date=1998-02-12 |access-date=2025-07-23 }}</ref><ref>{{Cite web |date=2017-05-26 |title=Before The Public Utilities Commission of the State of California |publisher=California Public Utilities Commission |url=https://www.cpuc.ca.gov/-/media/cpuc-website/files/uploadedfiles/cpuc_website/content/utilities_and_industries/communications/consumer_programs/area_codes/805/d-17-05-019.pdf |access-date=2025-07-23 }}</ref>

==Service area== The numbering plan area includes most of Kern County, most of northern Los Angeles County (specifically the Santa Clarita Valley, the Antelope Valley and the surrounding mountains), and small parts of Ventura County, Santa Barbara County, and Tulare County. Principal cities in the numbering plan area are Bakersfield, Lancaster, Palmdale, and Santa Clarita. ===Kern County=== {{div col|colwidth=9em}} *Arvin *Bakersfield *Bear Valley Springs *Buttonwillow *Caliente *Delano *Edwards Air Force Base *Famoso *Fellows *Frazier Park *Golden Hills *Grapevine *Havilah *Keene *Lake of the Woods *Lamont *Lebec *Lost Hills *Maricopa *McFarland *McKittrick *Mettler *Mojave *North Edwards *Oildale *Pine Mountain Club *Rosamond *Rosedale *Shafter *South Taft *Stallion Springs *Taft *Taft Heights *Tehachapi *Tupman *Valley Acres *Walker Basin *Wasco *Weedpatch *Wheeler Ridge {{div col end}}

===Los Angeles County=== {{div col|colwidth=9em}} *Acton *Agua Dulce *Antelope Acres *Castaic *Del Sur *Desert View Highlands *Gorman *Green Valley *Juniper Hills *Lake Hughes *Lake Los Angeles *Lancaster *Leona Valley *Littlerock *Llano *Neenach *Palmdale *Pearblossom *Quartz Hill *Santa Clarita *Stevenson Ranch *Valencia *Val Verde *Valyermo {{div col end}}

===Santa Barbara County=== {{div col|colwidth=9em}} *Cuyama *New Cuyama {{div col end}}

===Tulare County=== {{div col|colwidth=9em}} *Allensworth *Earlimart *Posey {{div col end}}

==See also== *List of California area codes *List of North American Numbering Plan area codes

==References== {{reflist}}

==External links== {{Area code footer|Map=CA}}

{{clear}} {{Area code box|State=CA |This=661 | N=559 | S=805/820, 747/818, 626 | E=442/760 | W=805/820 }}

{{coord|35|-118.7|region:US-CA_type:adm2nd|display=title}}

661 Category:Kern County, California Category:Area codes in Los Angeles County Category:Santa Barbara County, California Category:Tulare County, California Category:Mojave Desert Category:San Joaquin Valley Category:Bakersfield, California Category:Lancaster, California Category:Palmdale, California Category:Santa Clarita, California 661