A new area code will be added as an overlay to the Valley region starting March 26, 2025, according to the California Public Utilities Commission .
The new 357 area code will serve the same geographic area currently served by the existing 559 area code.
Currently, the 559 area code serves Central California and includes all or portions of Fresno, Madera, Mariposa, Merced, Tulare, and Kings counties. The 559 area code also serves communities such as Clovis, Coalinga, Fresno, Madera, Porterville, Reedley, Selma, and Visalia, as well as some unincorporated areas.
To help Valley residents transition to the overlay, the California Public Utilities Commission provided detailed information and tips.
357 area code: What you need to know
The addition of the 357 area code will require a new dialing procedure for anyone with a 559 or 357 area code, according to the utilities commission.
To complete calls from a landline phone, anyone with a 559 or 357 area code must dial 1 and then the area code and telephone number. This means that all calls from a 559 area code that are currently dialed with seven digits will need to be dialed using the new 1 and the area code and the telephone number dialing procedure.To complete calls from a mobile phone, callers will need to dial the area code and telephone number, or 1 and the area code and telephone number whenever placing a call from a phone number with the 559 or 357 area code.