Seattle, WA property records
As of September 2026, Seattle, WA has 198,865 parcels on record, with a median assessed value of $909,000 and a median year built of 1948, compiled from King County assessor, treasurer, permit, FEMA, and DNR records aggregated by VetTheHome. As of September 2026, 338 of those 198,865 parcels (0.2%) sit within a FEMA Special Flood Hazard Area, per King County GIS and FEMA flood records aggregated by VetTheHome.
Updated September 2026 · refreshed weekly
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Seattle by the numbers
Computed 9/7/2026 from county assessor, treasurer, permit, FEMA, and DNR records.
What the public records show
In the 12 months through September 2026, 6,047 properties in Seattle changed hands at a median recorded sale price of $975,000, and 15,580 building permits were filed, per King County records. As of September 2026, 1,034 parcels in Seattle (0.5%) rely on on-site septic systems rather than municipal sewer, per King County parcel records aggregated by VetTheHome. 8,651 (4.3%) of parcels in Seattle sit in high liquefaction-susceptibility zones mapped by the Washington State DNR. As of September 2026, 3,893 parcels in Seattle carried an unpaid property-tax balance with the King County Treasurer, per records aggregated by VetTheHome. As of September 2026, 82 homes in Seattle were resold within 12 months of a prior arms-length sale at a median gross price change of +54.5% between the two sales, per King County sales records aggregated by VetTheHome — local flip context, not a reliable rate given the small count (gross price change is a price difference, not profit, and excludes renovation and holding costs). Every figure here is compiled from public records and refreshed weekly; search any Seattle address below for parcel-level permit history, tax breakdown, flood and seismic hazards, and septic status.
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Explore aggregate King County property data by city — flood, septic, permits, taxes and more.