Area Code Lookup

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397 IN-SERVICE CODES
DATA 07/30/2026

657

In-service U.S. numbering code

657 Area Code

California · Pacific Time

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Location
California
Time zone
Pacific Time
In service since
23-Sep-2008
NANPA status
Active
Overlay codes
714
City references
No curated city reference is assigned on this site
Service type
Geographic
Source date
07/30/2026

NANPA indicates relief planning is in progress. Check the source report for current planning details.

What the 657 area code means

The 657 code is assigned in California. It participates in an overlay complex with 714, so those codes can serve the same or overlapping numbering region. A number carrying this code is not proof of the caller’s current location.

Codes in the same overlay complex

657Pacific Time714Pacific Time

Data source and limitations

The status fields above come from the NANPA NPA report dated 07/30/2026. City references are curated for navigation and do not replace exchange-level carrier data. Number portability also means a person can keep a number after moving.

Open the official NANPA CSV source.

Last updated: July 23, 2026

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Information the tool uses

Lookup text is sent to this site only to return a result. The application does not ask for GPS access, contacts, a phone number owner, or a street address. Recent lookups are stored only in your browser using local storage and can be removed by clearing site data.

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Data accuracy

Area-code status, state or territory, overlay relationships, service type, and in-service dates are derived from the NANPA NPA database. An area code can cover many communities, and a city label is a practical lookup aid rather than proof that a specific number or caller is physically located there.

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The service is provided “as is.” Numbering plans change, and no result should be treated as emergency, legal, financial, identity, or fraud-verification advice.

Contact

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