425 Area Code: Bellevue, Washington

The 425 area code covers the Eastside of the Puget Sound region, with Bellevue as the primary city. Bellevue sits across Lake Washington from Seattle, organized around a downtown core that has reshaped itself substantially over the past two decades alongside a substantial concentration of technology employment — Microsoft's main campus sits in nearby Redmond, and the surrounding cluster of technology firms has filled in much of the broader Eastside through the past three decades. The 425 footprint extends through Redmond, Kirkland, Bothell, Renton, and the surrounding cluster of King and Snohomish County communities east of Lake Washington.

In records the directory has compiled for 425 numbers, other Washington cities — Seattle, Spokane, Tacoma, and Vancouver — recur frequently. None of those are inside the 425 footprint. The pattern reflects standard public-record dynamics, with phone numbers porting across Washington and addresses linked across multiple cities. The directory currently documents 500 distinct prefixes within 425 in detail, a working subset of the prefix population the code carries.

Bellevue's median household income is the most striking demographic feature: at well above twice the US figure, the city carries one of the highest city-level income readings in the country, supported by the surrounding technology wage premium. Home values come in roughly four times the US median, the median age sits close to the US reading, and population places Bellevue among the larger Eastside cities — substantial enough to anchor its own civic identity within the broader Puget Sound metropolitan area.