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Area code 657

Where 657 is, how it is dialed, which carriers hold its numbers and how many of its codes are in use, from NANPA's 10/01/2026 files.

State
CA
In service
2008
Assigned codes
696of 800 possible
Carriers
29

About area code 657

NANPA lists 657 as an in-service geographic area code for California, first put into service on September 23, 2008. It is an overlay: 657 and 714 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 Anaheim, Huntington Beach, Santa Ana, Westminster, and Orange. By population, its largest named places are Anaheim, Santa Ana, Huntington Beach, Garden Grove, and Fullerton.

Area code 657: NANPA facts
ItemValue
StateCalifornia
In service sinceSeptember 23, 2008
Assigned by NANPAApril 1, 1999
OverlayYes, with 714
Parent area code (NANPA)714
Time zonePacific
Local calls within the code1 plus ten digits
Assigned central office codes696
Rate centers with codes13
Carriers holding codes29
Pooled codes694
Codes assigned since 2020445
Relief planning in progressYes

Source: NANPA NPA report and utilized central office code file, both dated 10/01/2026.

Where 657 numbers are local

657 holds 3.2% of the 22,087 central office codes assigned in California, the 22nd most of the state's 41 codes. 12 Census places could be matched to rate centers with 657 exchanges; the most populous are Anaheim (345,000), Santa Ana (316,000), Huntington Beach (193,000), and Garden Grove (172,000). For a storefront or service area inside 657, the place pages show which prefixes are rated local there.

Most populous places with 657 exchanges
PlacePopulation (2024)Area codesExchangesCarriers
Anaheim, CA344,561657, 71440327
Santa Ana, CA316,184657, 71431229
Huntington Beach, CA193,151657, 71418920
Garden Grove, CA172,361657, 7146519
Fullerton, CA140,054657, 7146318
Orange, CA137,941657, 7149519
Westminster, CA89,537657, 71410518
Buena Park, CA82,611657, 7143414
Yorba Linda, CA66,489657, 7143011
Placentia, CA53,395657, 7143716
Cypress, CA49,286657, 7145715
Brea, CA47,844657, 7142914

Population: Census Vintage 2024 estimates for the matched place. Exchanges and carriers: NANPA utilized code file.

Dialing 657 numbers

According to NANPA's dialing-plan data, local calls within 657 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits. Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere.

Who holds 657 exchanges

29 carriers hold the 696 central office codes assigned in 657. Cellco Partnership d/b/a Verizon Wireless - CA has the most, with 366 (53%). 694 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. Numbers can move between carriers through porting, so a code's holder tells you where the block started, not where every number lives now.

Largest code holders in area code 657
Carrier (NANPA operating company)ExchangesShare
Cellco Partnership d/b/a Verizon Wireless - CA36653%
T-mobile USA, INC.7411%
New Cingular Wireless PCS, LLC476.8%
Fractel, LLC405.7%
Bandwidth.com CLEC, LLC - CA355.0%
Onvoy, LLC - CA334.7%
Level 3 Communications, LLC - CA162.3%
Peerless Network of California, LLC - CA142.0%
TWC Ip Enabled Services, LLC131.9%
Teleport Communications America, LLC - CA91.3%
Ton80 Communications, LLC91.3%
Metropcs Networks, LLC81.1%

Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.

Local calling areas in 657

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 657 has codes in 13 rate centers. The table lists the rate centers with the most codes, with the matching Census place where the abbreviation could be matched.

Rate centers in area code 657 by assigned codes
Rate center (NANPA)PlaceCodes
ANAHEIMAnaheim, CA160
HUNTITNBCHHuntington Beach, CA139
SANTA ANASanta Ana, CA118
WESTMINSTRWestminster, CA60
SILVERADOnot matched53
ORANGEOrange, CA42
GARDEN GRVGarden Grove, CA30
CYPRESSCypress, CA27
FULLERTONFullerton, CA26
PLACENTIAPlacentia, CA11
YORBALINDAYorba Linda, CA11
BUENA PARKBuena Park, CA11
BREABrea, CA8

How full is area code 657?

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). 696 are assigned in 657, 87% of 800. 445 were assigned in 2020 or later. NANPA reports relief planning in progress for 657, the process used to add a new area code when one is projected to run out of codes.

Area code 657: central office codes by decade assigned
Decade assignedExchangesShare
2000s50.76%
2010s21232%
2020s44567%

Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.

A local 657 number on Callata

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

If you already have a number in area code 657, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.

Frequently asked questions

Where is area code 657?

657 is a geographic area code in California. Places with the most assigned exchanges include Anaheim, Huntington Beach, Santa Ana, and Westminster.

What time zone is area code 657 in?

NANPA lists 657 in the Pacific time zone.

When did area code 657 go into service?

NANPA records an in-service date of September 23, 2008. The code was assigned on April 1, 1999.

Is 657 an overlay area code?

Yes. It shares its territory with 714.

Can my business get a 657 phone number?

Callata includes up to 3 local numbers on its $99/month plan (5 users included). Which 657 numbers are open depends on carrier inventory when you choose, and you can port an existing number for free.