Limited In-Office* Services by Appointment Only Starting Monday June 15th

Available appointment times are between 9:00 a.m. - 11:30 a.m. and 1:30 p.m. - 3:00 p.m. Monday through Friday for the following services:

  • Senior Citizen and Disabled Persons tax relief applications and/or renewals
  • Mobile Home Transactions
  • Business Personal Property
  • Open Space and Agricultural use applications and renewals
  • Mapping Review and Support

Appointments may be made by calling 360-778-5050 or emailing

* Face masks are required for all citizens entering the Assessor’s Office

We are still here to help and most transactions can be taken care of over the phone, by email, or by mail.

  1. 2020 Change of Value Notices

    The 2020 Change of Value Notices were mailed November 19, 2020. Read on...
  2. Assessor Introduces GIS Tax Parcel Viewer

    The Whatcom County Assessor’s Office has launched an online Tax Parcel Viewer based on ArcGIS software. Read on...
  3. Limited In-Office Services Available by Appointment

    Starting Monday, June 15th citizens may begin making appointments for certain limited in-office services. Read on...
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Equitably establish taxable value for all real and taxable personal property in the County, maintain accurate and accessible property records, and provide prompt and professional customer service. Operate under the rules, regulations, and supervision contained in the Constitution of the State of Washington, set in Washington State Law (RCW), and directed by the Washington State Department of Revenue Administrative Code (WAC).


Established by state constitution and laws, directed by the Department of Revenue, the Assessor´s Office:

  • Appraises and revalues all real property, and physically inspects 1/6th of all real property, every year. Responds to building permit activity to include new construction additions
  • Maintains inventory, description, ownership, sales and mapping for all property
  • Publishes an annual tax booklet, which includes the statement of assessed valuations, tax rates and taxes levied within the various taxing districts of Whatcom County
  • Provides information, education and assistance
  • Provides public computer access to assessment data, also now available on the Internet through the Real Property Search
  • Allocates value to taxing districts, calculates levy rates and certifies tax roll to Treasurer
  • Administers and provides information for tax exemptions
  • Prepares defenses of valuations for Board of Equalization, State Board of Tax Appeals and courts