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King County Department of Assessments

Fair, equitable, and understandable property valuations
500 Fourth Ave.,
Seattle, WA 98104


Mon – Fri: 
8:30 a.m. to 4:30 p.m.

Tel: 206-296-7300
Fax: 206-296-5107
TTY: 206-296-7888


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The Assessor's Office is also available to speak to your organizations, service clubs, and community groups about the assessment process.

Please call 206-263-2261 or email us at to schedule a presentation on the assessment process.

Assessor's Office staff are available via e-mail, phone, and in person.


If you have questions or need assistance, please call us at the numbers listed below or dial toll free 1-800-325-6165, ext. 67300.

General Information

E-mail Address: Assessor.Info@KingCounty.Gov 206-296-7300
TTY Relay 711 or 800-833-6388
FAX 206-296-0107

Taxpayer Assistance

Real Property Information (property values, comparable sales, legal descriptions, appraisal help) 206-296-7300
Property Tax Advisor (Help with property values and appeals) 206-477-1060

Tax Relief

Senior & Disability Exemptions 206-296-3920
Senior & Disability Deferrals 206-296-3920
Home Improvement Exemptions 206-263-2338
Destroyed Property Exemptions 206-263-2332
Farm, Agriculture & Forest Land 206-263-2374
Open Space (PBRS) & Timber Land 206-477-4643
Historic Property Exemptions 206-263-2381
Non-profit organizations 206-263-2324

Personal Property

Business equipment/supplies lists 206-296-5126
Floating & mobile homes 206-296-5126

Tax Bill and Collection Information (King Co. Treasury)

Customer Service 206-296-3850
Manager's Office 206-296-7326
Real Property Tax Information 206-296-0923
Property Tax Refunds 206-296-3413
Property Tax Foreclosures 206-296-4184
Personal Property Tax Information 206-296-4290
Local Improvement District Records 206-296-3913

King County Recorder's Office

Real Estate Excise Tax 206-296-1570