King County Assessor's Office in King County, Washington

When visiting the county assessor's office, bring your property's parcel number or street address to quickly locate your assessment record, and bring supporting documentation if you are disputing a valuation. King County Assessor's Office is located at 500 4th Avenue, Seattle, WA. Many assessor offices also maintain online portals where you can review your assessed value and exemption status before visiting in person.

About King County Assessor's Office

The King County Assessor's Office, located in Seattle, Washington, determines the value of all taxable property in King County, WA. Taxable property includes land and commercial properties, often referred to as real property or real estate, and fixed assets owned by businesses, often referred to as personal property. Property assessments performed by the Assessor are used to determine the King County property taxes owed by individual taxpayers.

• Property assessment values and annual reassessment notices for parcels in King County Assessor's Office's jurisdiction
• Homestead, senior citizen, veteran, and disability exemption applications
• Formal assessment appeals and informal review requests
• GIS parcel maps, property boundary data, and ownership record corrections