Area code 559, Telephone prefix in Central Valley, California
Area code 559 is a telephone prefix serving the central San Joaquin Valley, covering Fresno, Madera, Kings, and Tulare counties in California. It connects a wide territory that ranges from the Fresno metropolitan area to smaller towns across this farming valley.
The California Public Utilities Commission created area code 559 in 1998 when it was split from area code 209. The division became necessary to accommodate the growing demand for telephone numbers in the region.
The telephone prefix connects diverse communities across the San Joaquin Valley, from urban centers to agricultural regions spanning multiple counties.
The region is expected to introduce the new overlay code 357 by September 2025, which means all calls will require ten digits going forward. Existing numbers will remain unchanged and will not need to be switched.
The region served by area code 559 contains multiple metropolitan areas and will transition to mandatory ten-digit dialing with the introduction of code 357.
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