The area code 425 is located in Bellevue, Washington.
Area code 425 serves Bellevue, Washington and the greater Eastside, just across Lake Washington from Seattle. Centered on Bellevue, WA, it covers fast-growing suburbs along the I‑405 and SR‑520 corridors in parts of King and Snohomish counties. This region is a major tech and business hub, home to global companies, vibrant downtowns, and easy access to the Cascade foothills. From lakeside parks to mountain trails, the 425 area blends city energy with Northwest nature.
Major cities and communities in area code 425 include:
Established in 1997 after a split from 206, 425 was added to handle rapid growth on the Eastside. It does not include Seattle proper (206), but it connects closely via the I‑90 and SR‑520 floating bridges over Lake Washington. Interesting local highlights include the Microsoft campus in Redmond, Bellevue’s downtown skyline, and Woodinville’s wineries, plus outdoor favorites like Snoqualmie Falls. Today, 10‑digit dialing is standard in Washington, making it easy to spot 425 phone numbers tied to Eastside businesses and residents.
“Area code 425 was created in 1997 as a split from 206 to serve Seattle’s Eastside.” — North American Numbering Plan Administration (NANPA)
Quick take: If you see a 425 number, it’s likely tied to Bellevue or nearby Eastside cities in King and Snohomish counties. This area code is closely linked to tech, retail, and outdoor recreation, reflecting the region’s mix of innovation and Pacific Northwest lifestyle.