Seatac, WA property records
As of September 2026, Seatac, WA has 6,570 parcels on record, with a median assessed value of $556,000 and a median year built of 1957, compiled from King County assessor, treasurer, permit, FEMA, and DNR records aggregated by VetTheHome. As of September 2026, 0 of those 6,570 parcels (0.0%) 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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Seatac 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, 150 properties in Seatac changed hands at a median recorded sale price of $607,000, and 7 building permits were filed, per King County records. As of September 2026, 1,043 parcels in Seatac (16%) rely on on-site septic systems rather than municipal sewer, per King County parcel records aggregated by VetTheHome. 11 (0.2%) of parcels in Seatac sit in high liquefaction-susceptibility zones mapped by the Washington State DNR. As of September 2026, 227 parcels in Seatac carried an unpaid property-tax balance with the King County Treasurer, per records aggregated by VetTheHome. Every figure here is compiled from public records and refreshed weekly; search any Seatac 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.