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The 425 area code is a dialing number that corresponds to the northern and eastern suburbs of Seattle in Washington State. This area code is the only codification in its service area so that it has no overlay. 

The region covered by the prefix 425 is known as the Eastside, which surrounds municipalities such as Everett, Redmond, Renton, Bellevue, Kirkland, among others. Besides, it covers King and Snohomish counties, two of the most populated of the state. 

For its part the Eastside is a technology center that encompasses several large high-tech companies, which contributes to the economic development of the region; some of these industries are Nintendo of America, Microsoft, T-Mobile US, AT&T Mobility, and others. 

Washington State

1. History

When AT&T and the Bell System established the North American Numbering Plan (NANP) in 1947, 86 original codifications started serving in Canada and the U.S. In this way, Washington State was covered by a single prefix, the 206 area code. 

This codification served the full state until the introduction of the prefix 509 in 1957, which surrounded eastern two-thirds of Washington. 

The activation of the 425 area code dates from April 27, 1997, as part of a three-way split of 206 that opened the way not only the 425 but also the 253 code. Since their introduction, both codes are the only codifications in their service area. 

At the moment, there’s no plan for an overlay in the 425 service area. However, the continuous growth of the telecommunication system could make necessary the addition of a second area code for this portion of the state.  

2. Location

Located in the Pacific Northwest region of the Western United States, Washington is the 42nd state admitted to the union, added on November 11, 1889. Referred as Washington State it is commonly confused with the county’s capital, Washington D.C. 

Washington State is compounded by 39 counties and 281 incorporated municipalities divided into towns and cities. Moreover, it is the 13th most populous state of the nation, encompassing 7.8 Million inhabitants, and the 18th most extensive covering a total area of 71,362 square miles. 

On the other hand, the Eastside of King County is the main service area of the prefix 425. Located on the east portion of Lake Washington, it represents a mix of suburbs that form part of the most populous county of the state. 

The 425 area code belongs to the Pacific Daylight time zone. This codification contains 58 non-unique postal area zip codes and surrounds 1702.94 square miles. 

Adjacent codes

The Washington telephone network is one of the smallest networks of the country constitutes 6 numbering plan areas for the entire region. In this way, the most populous codification is the 360 area code, serving more than 6.7 million residents and surrounding 20 counties in the western section of the state. 

As it was mentioned before, the original prefix assigned to the state is the 206 area code, introduced in 1947. On the other hand, the youngest codification is the 564 code included on August 28, 2017, as part of an overlay plan for the number 360. 

Another significant prefix for the state’s telephone service in the 509 area code, installed on January 1, 1957, becoming the second dialing number designated for Washington State. Currently, this code covers 22 counties and is the only prefix in its service area. 

3. Most Important Cities in the 425 Area Code


Situated on the eastern shore of Lake Washington, Bellevue is a primarily residential part of the Puget Sound urban area. Also, this city forms part of King County and is bordered by the municipalities of Kirkland to the north and Redmond to the northeast. 

Bellevue disposes of an estimated population of 144k inhabitants, being the third-most populous city of the Seattle metropolitan area and the fifth-most populous of Washington. Its incorporation dates from 1953, at the moment, it encompasses some of the major technology companies of the world. 

Bellevue’s population expands across 37.50 square miles and possesses 7 non-unique Zip codes: 98004, 98005, 98006, 98007, 98008, 98009, and 98015. 


Settled in 1890 and incorporated on May 4, 1893, Everett is the county seat and most extensive municipality of Snohomish County, covering around 47.91 square miles. Furthermore, its first inhabitants were the Snohomish People and other Native American tribes. 

Located on the Port Gardner Peninsula, Everett is the 7th most populous city of the state, encompassing nearly 109k residents. 

Currently, Everett’s postal service owns 7 non-unique ZIP codes: 98201, 98203, 98204, 98206, 98207, 9820, and 98213. 


Situated in King County, Renton is an inner suburb of Seattle. It lies in the southeast shore of Lake Washington, at the mouth of the Cedar River, and covers nearly 25.23 square miles. 

Encompassing around 101k inhabitants Renton is the 8th most populous city of Washington and the 6th most populated in the Greater Seattle urban area. 

Covered by the 425 area code this municipality possesses 5 non-unique ZIP codes: 98055, 98056, 98057, 98058, and 98059. 

Other Important Locations and ZIP Codes of the 425 Area Code

The 425 area code belongs to the eastern portion of King County and encloses 2 of the 39 Washington counties: 

  • King County: founded on December 22, 1852, it is the most populous county in Washington with around 2.1 million people. Covering a total area of 2,307 square miles it disposes of 120 ZIP codes


  • Snohomish County: included in the Greater Seattle metro area, Snohomish is the third-most populous county in Washington, enclosing over 789k inhabitants. Located in Western Washington, this county covers over 2,196 square miles of total area and owns 35 Zip codes.

Main Postal and Shipping Services

  • Pak Mail, Bellevue, WA,  +1 425-803-0627
  • Goin' Postal Bellevue, Bellevue, WA,- +1 425-747-8222
  • Apex World Transport Inc, Renton, WA, - +1 425-203-8888
  • The UPS Store, Everett, WA,- +1 425-353-9144

4. FAQs

How many counties cover the 425 area code?

The 425 covers the eastern side of King County and some portions of Snohomish County.

What is the overlay for the 425 area code?

The 425 area code is the only prefix in its region and has no overlay.