Issaquah, WA property records
As of November 2026, Issaquah, WA has 12,355 parcels on record, with a median assessed value of $1,305,700 and a median year built of 1993, compiled from King County assessor, treasurer, permit, FEMA, and DNR records aggregated by VetTheHome. As of November 2026, 300 of those 12,355 parcels (2.4%) sit within a FEMA Special Flood Hazard Area, per King County GIS and FEMA flood records aggregated by VetTheHome.
Updated November 2026 · refreshed weekly
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Issaquah by the numbers
Computed 11/9/2026 from county assessor, treasurer, permit, FEMA, and DNR records.
What the public records show
In the 12 months through November 2026, 415 properties in Issaquah changed hands at a median recorded sale price of $1,406,000, and 10 building permits were filed, per King County records. As of November 2026, 3,597 parcels in Issaquah (29%) rely on on-site septic systems rather than municipal sewer, per King County parcel records aggregated by VetTheHome. 1,738 (14%) of parcels in Issaquah sit in high liquefaction-susceptibility zones mapped by the Washington State DNR. As of November 2026, 145 parcels in Issaquah 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 Issaquah 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.