California · Pacific Time
357 Area Code
Area code 357 is in California, serving southern San Joaquin Valley including Fresno, Visalia, Clovis and Hanford. It is in the Pacific Time zone. It shares its territory with overlay code 559, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 357 area code?
357 is a California area code covering southern San Joaquin Valley including Fresno, Visalia, Clovis and Hanford. In the wider directory it sits in the West region.
Cities in the 357 area code
- Fresno
- Visalia
- Clovis
- Hanford
- Tulare
- Madera
- Porterville
- Reedley
- Selma
- Sanger
- Lemoore
- Dinuba
Counties served by 357
Fresno County, Tulare County, Kings County and Madera County.
357 overlay codes and dialing
The 357 territory is covered by an overlay of 2 area codes: 357, 559. All of them serve the same geographic area, and the original code is 559. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 357 area code
357 went into service on March 26, 2025 as an overlay of 559, relieving number exhaustion in the Fresno area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 357 a scam or spam risk?
357 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 357 number on your screen is no guarantee the caller is in Fresno, CA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other California area codes
Explore more
See every code in California, compare codes across the West region, or view all Pacific Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
357 area code FAQ
Where is the 357 area code?
The 357 area code is in California, covering southern San Joaquin Valley including Fresno, Visalia, Clovis and Hanford, in the West region.
What cities are in the 357 area code?
Cities in the 357 area code include Fresno, Visalia, Clovis, Hanford, Tulare, Madera, Porterville, Reedley, Selma and Sanger.
What time zone is 357 in?
357 is in the Pacific Time zone.
What is the overlay for the 357 area code?
357 shares its territory with 559. Both codes (357, 559) serve the same area, so 10-digit dialing is required for every call.
When did the 357 area code start?
357 went into service on March 26, 2025 as an overlay of 559.
Do I have to dial 10 digits for 357?
Yes. Because 357 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 357 a toll-free or premium code?
No. 357 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.