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, with major localities of Bakersfield 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.[1][2]
- ^ "Planning Letter 111: NANP-Split of 805 (California) Numbering Plan Area (NPA)" (PDF). NANPA. 1998-02-12. Retrieved 2025-07-23.
- ^ "Before The Public Utilities Commission of the State of California" (PDF). California Public Utilities Commission. 2017-05-26. Retrieved 2025-07-23.