---
title: "Area code 425: Washington, United States"
url: "https://lookvalid.com/area-code/425.md"
canonical_url: "https://lookvalid.com/area-code/425"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 425 serves Washington, United States. Number formats, numbering rules, a live phone validator and the other codes in Washington."
---

# Area code 425: Washington, United States

Area code 425 serves Washington, United States. Number formats, numbering rules, a live phone validator and the other codes in Washington.

NANPA lists 628 central office codes (prefixes) in use in area code 425, held by 32 holders across 14 rate centers.
Ziply Fiber holds the most prefixes, 124 (20%). 65% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 3,727 complaints on file for 2,612 numbers in 425, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- In service since: 1997-04-27
- Time zone: Pacific (P)
- Prefixes in use: 628
- Pooled prefixes: 406 (65%)
- Rate centers: 14
- Companies holding prefixes: 32
- Assignment dates on file: 2001-01-24 to 2026-04-20 (197 prefixes)
- ZIP codes in its places: 32

## Rate centers

| Rate center | Prefixes | Share |
| --- | --- | --- |
| BELLEVUE | 181 | 29% |
| EVERETT | 121 | 19% |
| KIRKLAND | 80 | 13% |
| BOTHELL | 59 | 9% |
| HALLS LAKE | 53 | 8% |
| RENTON | 53 | 8% |
| ISSAQUAH | 34 | 5% |
| SILVERLAKE | 17 | 3% |
| 6 other rate centers | 30 | 5% |

## Carriers

| Holder | Prefixes | Share |
| --- | --- | --- |
| Ziply Fiber | 124 | 20% |
| T-Mobile USA | 91 | 14% |
| Qwest | 69 | 11% |
| Level 3 Communications | 49 | 8% |
| New Cingular Wireless PCS | 44 | 7% |
| Onvoy | 41 | 7% |
| 26 other carriers | 210 | 33% |

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

- 1947-01-01: Area code 206, named as the parent of 425 in the NANPA report, was in service.
- 1997-04-27: Area code 425 went into service.

## Nearest area codes

The area codes closest to 425, measured between the centers of the ZIP code places they serve, are 206 (about 8 miles), 253 (about 29 miles), 360 (about 62 miles), 564 (about 62 miles) and 971 (about 158 miles).

## ZIP codes

32 ZIP codes fall in places that have a rate center in this area code. The places with the most are Bellevue, WA (7 ZIP codes), Everett, WA (7 ZIP codes) and Renton, WA (5 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

3,727 complaints for 2,612 numbers. Numbers whose latest complaint falls in each year:

- 2023: 124
- 2024: 130
- 2025: 140

## Questions

### Where is area code 425?

NANPA assigns area code 425 to Washington, United States.

### In which state does area code 425 sit?

Washington. 425 is one of 6 area codes the NANPA table assigns to the state.

### Which places does area code 425 cover?

The places with the most ZIP codes among the rate centers in 425 are Bellevue, WA, Everett, WA and Renton, WA. The rate center list on this page shows all of them.

### Who owns area code 425?

NANPA assigns area codes. Within 425, Ziply Fiber holds the most prefixes, 124 prefixes or 20%.

### Which time zone does 425 use?

The NANPA NPA report lists the time zone for 425 as Pacific (P).

### What year did 425 enter service?

The NANPA NPA report gives an in-service date of 1997-04-27, so 425 has been in use since 1997.

### Does area code 425 have an overlay?

The NANPA NPA report lists no other area code in an overlay with 425.

### Which area codes are nearest to 425?

The area codes closest to 425, measured between the centers of the ZIP code places they serve, are 206 (about 8 miles), 253 (about 29 miles), 360 (about 62 miles), 564 (about 62 miles) and 971 (about 158 miles).

### How many prefixes does area code 425 have?

NANPA's report dated 2026-10-17 lists 628 prefixes in service in 425, spread over 14 rate centers and 32 holders.

### Are there complaints about 425 numbers?

The FCC data on file has 3,727 complaints for 2,612 numbers in 425. 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).