Area code 357

About area code 357

Area code 357 is a geographic area code in California, in service since March 26, 2025, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 357 and 559 cover the same territory, so neighbors on the same street can have different area codes. It is in the Pacific time zone. The places with the most assigned exchanges include Kingsburg, Firebaugh, Clovis, Sanger, and Hanford. By population, its largest named places are Fresno, Visalia, Clovis, Hanford, and Sanger.

Cities and towns in area code 357

357 holds 0.03% of the 22,087 central office codes assigned in California, the 41st most of the state's 41 codes. 7 Census places could be matched to rate centers with 357 exchanges; the most populous are Fresno (550,000), Visalia (146,000), Clovis (128,000), and Hanford (60,594). Each place page lists the exact prefixes and carriers for that town.

Ten-digit and seven-digit dialing in 357

According to NANPA's dialing-plan data, local calls within 357 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "10-digit dialing permissible at wireless providers discretion"

Who holds 357 exchanges

4 carriers hold the 7 central office codes assigned in 357. Onvoy, LLC - CA has the most, with 4 (57%). 7 of the codes (100%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Local calling areas in 357

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 357 has codes in 7 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

Number supply in 357

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 7 are assigned in 357, 0.88% of 800. 7 were assigned in 2020 or later.

A local 357 number on Callata

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

Porting a number you already use in area code 357 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.