Wealthiest ZIP codes in King, Pierce and Snohomish counties as determined by ESRI's proprietary formula The PSBJ worked with a GIS mapping service to determine which are the wealthiest areas in ...

Medina's 98039 — where billionaires Bill Gates and Jeff Bezos both have homes — has been dethroned as the Seattle area's wealthiest ZIP code. See which city swept the No. 1 and No. 2 spots.