Is Tualatin in Washington County or Clackamas County, Oregon?
Tualatin spans both Washington and Clackamas counties, but the majority of the city sits in Washington County while its eastern edge extends into Clackamas County. This dual‑county...
Tualatin · Community Photo
Tualatin spans both Washington and Clackamas counties, but the majority of the city sits in Washington County while its eastern edge extends into Clackamas County. This dual‑county layout affects everything from property taxes to school districts, giving residents a clear picture of what county Tualatin, Oregon belongs to.
Quick Answer: Tualatin spans two counties
If you’re askingwhat county is Tualatin, Oregon, the city is situated in both Washington County and a smaller portion of Clackamas County. The majority of its land area and its roughly 28,139 residents (2025 census) lie in Washington County, while the eastern‑southeastern section falls within Clackamas County.
Yes,is Tualatin part of Clackamas County—it is, but only for that eastern segment. Likewise,is Tualatin part of Washington County—the answer is definitely yes, encompassing most of the city, including City Hall at 18880 SW Martinazzi Avenue.
Tualatin Oregon County Boundaries: Washington vs Clackamas
Tualatin Geography Overview
In terms oftualatin oregon county boundaries, the city sits chiefly within Washington County while a modest eastern segment extends into Clackamas County. This dual‑county layout is a defining feature of the area’s geography.
County Boundary Details
All land west of 65th Avenue falls under Washington County jurisdiction.
All land east of 65th Avenue is part of Clackamas County.
City Limits and Administration
Thetualatin city limitscross both county lines, but municipal operations remain unified. City Hall and the central administrative offices are located at 18880 SW Martinazzi Avenue, which lies inside Washington County. From this hub, the city‑wide police department, parks and recreation services, public works, and the elected city council coordinate services for every resident, regardless of the county in which they reside.
For more information about city services and contacts, visit theCity of Tualatin official website.
Feature / Jurisdiction | Washington County Portion | Clackamas County Portion |
|---|---|---|
Geographic extent (population & land) – Washington County vs Clackamas County Tualatin | Majority of Tualatin’s population and land area; the city is located primarily in Washington County. | Smaller eastern/southern portion extending into Clackamas County. |
Municipal city government (see tualatin county map) | City of Tualatin | City of Tualatin |
Tualatin Property Taxes & Tax Assessor: Washington vs. Clackamas
Property Tax Assessment in Tualatin
Tualatin property taxesare administered by two county tax authorities because the city spans both Washington and Clackamas counties. Most of the city lies west of 65th Avenue, which places those parcels in Washington County; parcels east of 65th Avenue fall under Clackamas County jurisdiction.
The city’s municipal offices, including City Hall at 18880 SW Martinazzi Avenue, are situated in Washington County, reinforcing the primary county affiliation.
Key assessment points
County responsibility: The Washington County tax office handles assessment, billing, and collection for the majority of Tualatin homes, while the Clackamas County assessor’s office performs those functions for the smaller eastern portion.
Assessed values: Both counties follow Oregon’s Measure 50 guidelines, but slight variations in millage rates can cause assessed values to differ marginally between the two sides of the city.
Tax bills: Homeowners receive their property‑tax statements from the county that contains their parcel—Washington County for west‑side properties and Clackamas County for east‑side properties—even though the city‑wide service levies remain the same.
Why the difference matters
When you compareWashington county property tax vs Clackamas countyrates, the underlying city levies (for police, fire, streets, and parks) are identical, but each county may apply its own general‑purpose millage, which can affect the total amount due each year.
For any questions about your specific bill, you can contact the appropriateTualatin tax assessoroffice—Washington County’s tax office for parcels west of 65th Avenue, or the Clackamas County assessor for parcels east of that line.
Tualatin School District, Fire District TVFR, WCCLS Library
Public Services Across County Lines
While most of Tualatin lies in Washington County, the area east of 65th Avenue belongs to Clackamas County. Both sides of the city receive the same coordinated services.
Tualatin School District: The Tigard‑Tualatin School District (TTSD 23J) educates every student in the city, regardless of whether a household is in Washington or Clackamas County.
Tualatin Fire District TVFR: Tualatin Valley Fire & Rescue (TVF&R) provides fire suppression and emergency‑medical response to all neighborhoods, spanning both county jurisdictions.
Tualatin Library WCCLS: The city’s public library is a member of the Washington County Cooperative Library Services (WCCLS) network and welcomes patrons from both counties.
Moving to Tualatin Real Estate County Considerations
Moving to Tualatin?Verify your parcel’s county jurisdiction before you close—everything west of 65th Avenue lies in Washington County, while the small eastern/southern section falls within Clackamas County. The city’s official site explains the boundary map and offers a contact form for property‑verification questions.tualatinoregon.gov
Buying a home in Tualatinmeans recording your deed with the correct county recorder’s office (Washington or Clackamas) to ensure a clean title. This step also determines which county‑level property taxes and building‑code inspections will apply to your new residence.
Tualatin real estate county considerationsextend to civic participation. Your address decides which county commissioner district you belong to and which primary elections you’ll vote in, so update your voter registration accordingly. Utilities, mail delivery (ZIP 97062), and city services such as police and fire protection remain consistent city‑wide regardless of the county line. For a full overview of services, see the city’s “New to Tualatin” page.New to Tualatin Page
Tualatin Oregon FAQ: What County Is Tualatin In?
Tualatin is a dual‑county municipality. The majority of the city lies in Washington County, while the portion east of 65th Avenue falls within Clackamas County. This split means that both answers are technically correct, but Washington County contains most of the land and residents.
Legal summons and jury‑duty notices follow the county where a property is recorded. Residents whose address is in Washington County receive notices from the Washington County Circuit Court in Hillsboro. Those located in the Clackamas County portion receive notices from the Clackamas County Circuit Court in Oregon City.
Public school assignments are determined by the Tigard‑Tualatin School District boundaries, not by the county line. Whether a home sits in Washington or Clackamas County, students attend schools in the same district.
