Washington County, Oregon Property Taxes

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Property Taxes in Washington County, Oregon

Median Washington County effective property tax rate: 0.95%, significantly lower than the national median of 1.02%.
Median Washington County home value: $545,280
Median annual Washington County tax bill: $5,108, higher than the national median property tax bill of $2,400.

How are property taxes in Washington County calculated?

Property taxes in Washington County are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding your county's property tax system, exemptions, and reduction opportunities can lead to significant savings. Whether you live in Washington County or another part of Washington County, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Washington County, Oregon Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

0.95%

Estimate Property Tax Bill

$5,180

$4,807

How Does the Washington County Property Tax Calculator Work?

Use this Washington County property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Washington County's median effective tax rate of 0.95% to generate your estimate.

Enter your property's estimated assessed value — the figure used for tax purposes, which is typically lower than market value after applicable exemptions. Our calculator uses the median effective rate for a more accurate estimate than the statutory millage rate alone.

Your actual bill may vary based on your specific exemptions, local school district levies, and any special assessment districts that apply to your property. Washington County's median effective tax rate is lower than the Oregon state median tax rate of 0.87%, while the county's median property tax bill of $5,108 is $2,708 higher than the state median.

For a more precise estimate, scroll down to explore city and ZIP code-level tax rate trends across Washington County.

Property Tax Rates Across Washington County, Oregon

What Are Effective Property Tax Rates Across Washington County?

Local government entities set tax rates, which vary widely across Washington County. Each year, the county estimates its budget for public services and divides that total by the assessed value of all taxable property within its jurisdiction.

Below, compare Washington County's effective property tax rate to other counties in Oregon or the U.S. median of 1.02%.

Washington County's median effective rate stands at 0.95%, which is lower than the national median of 1.02%. Within Washington County, the highest rate is found in Sherwood at 1.01%, while Scappoose has the lowest at 0.58%.

These variations reflect differences in local school district levies, special assessment districts assessments, and special district bonds — which compound the base county rate.

Property Tax Rates Across Washington County, Oregon

Source: Ownwell

0.58%

0.95%

1.33%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Washington County Tax Rate

0.95%

Median Effective Oregon Tax Rate

0.87%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Washington County, Oregon

City	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
Banks	0.65%	0.78%	0.94%	1.05%	1.10%
Beaverton	0.76%	0.87%	1.00%	1.15%	1.29%
Buxton	0.51%	0.64%	0.76%	0.95%	1.41%
Cornelius	0.66%	0.78%	0.86%	0.94%	1.00%
Forest Grove	0.72%	0.85%	0.95%	1.03%	1.12%
Gales Creek	0.52%	0.63%	0.73%	0.84%	1.01%
Gaston	0.49%	0.59%	0.69%	0.83%	1.11%
Hillsboro	0.69%	0.78%	0.86%	0.92%	0.99%
Lake Oswego	0.54%	0.57%	0.69%	0.77%	0.95%
Manning	0.54%	0.70%	0.79%	0.89%	1.20%
Newberg	0.46%	0.58%	0.66%	0.72%	0.85%
North Plains	0.53%	0.68%	0.78%	0.83%	0.86%
Portland	0.78%	0.88%	0.98%	1.10%	1.20%
Scappoose	0.34%	0.47%	0.58%	0.66%	0.75%
Sherwood	0.75%	0.90%	1.01%	1.09%	1.18%
Tigard	0.73%	0.73%	0.80%	1.29%	1.38%
Timber	0.39%	0.46%	0.60%	0.75%	0.92%
Tualatin	0.83%	0.88%	0.96%	1.10%	1.20%
Unincorporated	0.73%	0.84%	0.98%	1.24%	1.39%
Azalea	N/A	N/A	N/A	N/A	N/A
Bay City	N/A	N/A	N/A	N/A	N/A
King City	N/A	N/A	N/A	N/A	N/A
Vernonia	N/A	N/A	N/A	N/A	N/A
Washington County	N/A	N/A	N/A	N/A	N/A
Wilsonville	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Assessment Values Across Washington County, Oregon

When examining property taxes in Washington County, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Washington County appraisal district estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In Washington County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of October.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Washington County.

For example, the median tax bill in Washington County is $5,108, with tax bills ranging significantly across the county. Lake Oswego has the highest median home price at $987,940.

Property Tax Assessment Values Across Washington County, Oregon

Source: Ownwell

$290,450

$643,180

$995,910

Median Washington County Market Value

$545,280

Median Oregon Market Value

$450,850

Median United States Market Value

$235,294

Property Tax Assessment Values Across Washington County, Oregon

City	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
Banks	$47,547	$387,872	$504,395	$610,690	$819,595
Beaverton	$327,374	$423,970	$515,780	$612,752	$726,338
Buxton	$3,328	$29,410	$290,450	$486,130	$661,920
Cornelius	$101,310	$384,620	$436,870	$526,785	$625,540
Forest Grove	$222,160	$411,700	$477,900	$585,785	$691,828
Gales Creek	$37,222	$217,342	$357,060	$513,155	$639,962
Gaston	$70,994	$319,510	$451,800	$650,375	$830,444
Hillsboro	$372,310	$441,610	$513,210	$600,390	$718,480
Lake Oswego	$290,246	$486,385	$987,940	$1,264,155	$1,299,716
Manning	$5,860	$134,925	$417,200	$653,820	$759,306
Newberg	$349,116	$583,130	$827,750	$1,020,070	$1,234,686
North Plains	$312,753	$429,738	$530,940	$616,175	$728,501
Portland	$383,260	$515,282	$634,160	$786,425	$953,588
Scappoose	$4,890	$43,642	$403,295	$572,540	$654,650
Sherwood	$321,250	$478,312	$571,275	$698,450	$855,032
Tigard	$2,210	$2,210	$22,070	$413,220	$838,222
Timber	$15,375	$206,228	$314,975	$441,588	$544,850
Tualatin	$330,590	$490,750	$561,160	$690,430	$809,596
Unincorporated	$2,326	$24,620	$516,350	$677,880	$886,212
Azalea	N/A	N/A	N/A	N/A	N/A
Bay City	N/A	N/A	N/A	N/A	N/A
King City	N/A	N/A	N/A	N/A	N/A
Vernonia	N/A	N/A	N/A	N/A	N/A
Washington County	N/A	N/A	N/A	N/A	N/A
Wilsonville	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Bills Across Washington County, Oregon

Property tax bills in Washington County, Oregon are based on the assessed value of a home and the local tax rates set by taxing districts. The county’s median home price is $545,280, and that value helps determine the tax bill after assessment. Homeowners with properties in higher-value areas or with more local levies generally pay more, while lower-assessed homes pay less.

The tax bill is shaped by several factors, including the home’s assessed value, the mix of school, city, county, and special district taxes, and any applicable exemptions. In Washington County, the 25th percentile tax bill is $3,928, while the 75th percentile reaches $6,890 and the 90th percentile climbs to $9,040. That range shows how much bills can vary across the county.

For homeowners, a higher assessed value can mean a larger annual bill, which can affect monthly budgeting and long-term housing costs.

Property Tax Bills Across Washington County, Oregon

Source: Ownwell

$1,720

$5,743

$9,766

Median Washington County Tax Bill

$5,108

Median Oregon Tax Bill

$3,806

Median United States Tax Bill

$2,400

Property Tax Bills Across Washington County, Oregon

City	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
Banks	$1,011	$3,321	$4,852	$5,870	$7,155
Beaverton	$3,102	$3,876	$4,950	$6,587	$8,594
Buxton	$170	$919	$2,461	$3,748	$5,485
Cornelius	$1,939	$3,267	$3,819	$4,674	$5,693
Forest Grove	$2,601	$3,685	$4,541	$5,784	$7,153
Gales Creek	$567	$1,669	$2,738	$3,823	$5,169
Gaston	$1,014	$2,178	$3,348	$4,623	$6,033
Hillsboro	$2,950	$3,566	$4,365	$5,341	$6,575
Lake Oswego	$2,299	$4,334	$7,232	$7,232	$7,802
Manning	$87	$2,063	$3,585	$5,188	$7,123
Newberg	$1,969	$4,122	$5,673	$6,884	$8,451
North Plains	$1,654	$2,932	$4,098	$4,910	$5,647
Portland	$3,487	$4,601	$6,161	$8,233	$10,459
Scappoose	$32	$338	$1,720	$3,134	$3,906
Sherwood	$2,767	$4,452	$5,711	$7,310	$9,176
Tigard	$16	$16	$293	$2,592	$10,265
Timber	$581	$1,218	$2,048	$2,919	$4,466
Tualatin	$2,820	$4,362	$5,400	$7,521	$9,045
Unincorporated	$197	$522	$4,900	$7,138	$8,482
Azalea	N/A	N/A	N/A	N/A	N/A
Bay City	N/A	N/A	N/A	N/A	N/A
King City	N/A	N/A	N/A	N/A	N/A
Vernonia	N/A	N/A	N/A	N/A	N/A
Washington County	N/A	N/A	N/A	N/A	N/A
Wilsonville	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	December 31

Links
Washington Tax Assessor
Website	washcotax.co.washington.or.us

Frequently Asked Property Tax Questions in Washington County, Oregon

How are property taxes calculated in Washington County, Oregon?

Property taxes in Washington County, Oregon are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.

How do I appeal my property taxes in Washington County, Oregon?

To appeal your property taxes in Washington County, Oregon, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.

What property tax exemptions are available in Washington County, Oregon?

Common property tax exemptions in Washington County, Oregon include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.

When are property taxes due in Washington County, Oregon?

Property tax deadlines in Washington County, Oregon vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.

How can Ownwell help reduce my property taxes in Washington County, Oregon?

Ownwell provides professional property tax appeal services in Washington County, Oregon. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.