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.


The Assessment and Taxation Department has moved to the Charles D. Cameron Public Services Building located at 155 N First Avenue, Hillsboro. The location is indicated by the red star below.  

Please note that access to the building is from either Lincoln Street or First Avenue.

New Location:

A&T Map PNG 

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.

Payment Drop Box

Two drop boxes are located at the Public Service Building, 155 N First Ave., Hillsboro. The 24 hour drop box site is located at the West side of the building; the other drop box site will be available the latter part of August. 

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