Assessment & Taxation

The responsibilities of the Department of Assessment and Taxation include appraisal and assessment of property; collection of property taxes for all taxing entities; recording documents, land plats, issuing marriage licenses, records retention and administration of Elections.

Assessment and Taxation is located at 161 NW Adams Avenue, Hillsboro, OR 97124. Mailing address is 155 N First Avenue, Suite 230, Hillsboro, OR 97124.

Adams Crossing

Assessment & Taxation - Property Tax Prepayments

Washington County is unable to accept any prepayments on taxes for the 2018/2019 tax year. Per Oregon Revised Statutes, pre-collection of funds may not be allowed, unless under specific situations such as omitted property which adds taxes to the roll; prepayment to the Oregon Department of Revenue for senior deferral balances; partition and plats of parcels or making a subdivision; and other situations outlined in ORS 311.370. According to the Oregon Administrative Rules (OAR 150-311-0260) unless authorized by law, no prepayments of property taxes which have not been certified by a taxing district, shall be collected or accepted.

2018 Business Personal Property Seminar

Washington County's Assessment and Taxation Department is hosting a seminar to help navigate the personal property filing requirements and answer questions. This informational event is scheduled for Thursday, January 18, 2018 from 1:30 3:30 p.m. at the Hillsboro Brookwood Library. For more information please visit the Business Personal Property Overview.

Payment Drop Box

Two drop boxes are located at the Adams Crossing Building, 161 NW Adams Ave., Hillsboro. The 24 hour drop box site is located at the North side of the building; the other drop box site is available Monday through Friday 8:30 am - 5:00 pm, located in the Adams Crossing Building hallway outside Room 102.

For general tax questions, please see Property Tax Questions.  If you are looking for specific tax data relevant to your property, please call our office at 503-846-8741.

Mail Payment

Property Tax Payment Center
PO Box 3587
Portland, OR 97208-3587


Washington County
Assessment & Taxation 
155 N First Avenue, Suite 130 MS8
Hillsboro, OR 97124


Pay Taxes Online