---
title: "Area code 657: California, United States"
url: "https://lookvalid.com/area-code/657.md"
canonical_url: "https://lookvalid.com/area-code/657"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 657 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California."
---

# Area code 657: California, United States

Area code 657 serves California, United States. Number formats, numbering rules, a live phone validator and the other codes in California.

NANPA lists 692 central office codes (prefixes) in use in area code 657, held by 28 holders across 13 rate centers.
Verizon Wireless holds the most prefixes, 362 (52%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 1,723 complaints on file for 1,129 numbers in 657, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- In service since: 2008-09-23
- Time zone: Pacific (P)
- Assigned overlays: 714 (1951-01-01)
- Prefixes in use: 692
- Pooled prefixes: 690 (100%)
- Rate centers: 13
- Companies holding prefixes: 28
- Assignment dates on file: 2008-08-08 to 2026-08-07 (658 prefixes)
- ZIP codes in its places: 61

## Rate centers

| Rate center | Prefixes | Share |
| --- | --- | --- |
| ANAHEIM | 159 | 23% |
| HUNTITNBCH | 138 | 20% |
| SANTA ANA | 118 | 17% |
| WESTMINSTR | 59 | 9% |
| SILVERADO | 52 | 8% |
| ORANGE | 42 | 6% |
| GARDEN GRV | 30 | 4% |
| CYPRESS | 27 | 4% |
| 5 other rate centers | 67 | 10% |

## Carriers

| Holder | Prefixes | Share |
| --- | --- | --- |
| Verizon Wireless | 362 | 52% |
| T-Mobile USA | 74 | 11% |
| New Cingular Wireless PCS | 47 | 7% |
| Fractel | 40 | 6% |
| Bandwidth.com CLEC | 35 | 5% |
| Onvoy | 33 | 5% |
| 22 other carriers | 101 | 15% |

A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company.

## History

- 1951-01-01: Area code 714, named as the parent of 657 in the NANPA report, was in service.
- 2008-09-23: Area code 657 went into service.

## Nearest area codes

The area codes closest to 657, measured between the centers of the ZIP code places they serve, are 949 (about 11 miles), 562 (about 15 miles), 626 (about 20 miles), 909 (about 26 miles) and 310 (about 27 miles).

## ZIP codes

61 ZIP codes fall in places that have a rate center in this area code. The places with the most are Anaheim, CA (17 ZIP codes), Orange, CA (11 ZIP codes) and Santa Ana, CA (11 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

1,723 complaints for 1,129 numbers. Numbers whose latest complaint falls in each year:

- 2023: 62
- 2024: 58
- 2025: 66

## Questions

### Where is area code 657?

NANPA assigns area code 657 to California, United States.

### In which state does area code 657 sit?

California. 657 is one of 41 area codes the NANPA table assigns to the state.

### Which places does area code 657 cover?

The places with the most ZIP codes among the rate centers in 657 are Anaheim, CA, Orange, CA and Santa Ana, CA. The rate center list on this page shows all of them.

### Who owns area code 657?

NANPA assigns area codes. Within 657, Verizon Wireless holds the most prefixes, 362 prefixes or 52%.

### Which time zone does 657 use?

The NANPA NPA report lists the time zone for 657 as Pacific (P).

### What year did 657 enter service?

The NANPA NPA report gives an in-service date of 2008-09-23, so 657 has been in use since 2008.

### Does area code 657 have an overlay?

Yes. 714 (in service 1951-01-01) shares the same area with 657, so numbers from all of them are local to each other.

### Which area codes are nearest to 657?

The area codes closest to 657, measured between the centers of the ZIP code places they serve, are 949 (about 11 miles), 562 (about 15 miles), 626 (about 20 miles), 909 (about 26 miles) and 310 (about 27 miles).

### How many prefixes does area code 657 have?

NANPA's report dated 2026-10-17 lists 692 prefixes in service in 657, spread over 13 rate centers and 28 holders.

### Are there complaints about 657 numbers?

The FCC data on file has 1,723 complaints for 1,129 numbers in 657. They are unverified consumer reports. A number with no complaints on file is not proven safe.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).