How Property Assessment Is Organised Across Oregon's 36 Counties

Property assessment in Oregon is a county job carried out under state rules. Each of the state's 36 counties has an assessor's office that finds, measures and values every taxable property inside its borders. Whether you own a bungalow in Eugene, a ranch near Burns or a storefront in Hillsboro, the same set of statutes applies to you.

The state's role is oversight. The Oregon Department of Revenue supervises the property tax system, writes administrative rules and reviews how counties run their appraisal programs. Assessment law sits mainly in Oregon Revised Statutes chapter 308, and collection rules sit in chapter 311. The county does the day-to-day work, and the state sets the framework.

Some counties elect their assessor and others appoint one. Many combine assessment and tax collection in a single department, so the front counter you visit may handle valuation questions, exemption forms and payments together. In other counties the tax collector is a separate desk or a separate building. A quick phone call saves a wasted trip.

The assessor does not set your tax rate. Rates come from the local taxing districts, such as schools, cities, fire districts and libraries, that appear on your tax statement. The assessor's job is the value those rates are applied to, plus exemptions, special assessments and the property records behind them.

What an Oregon county assessor's office actually does

The work is more varied than most owners expect. A typical Oregon assessor's office handles the following:

Recording a deed is the county clerk's task, not the assessor's. The assessor learns about the sale afterward and updates the account. If you have just bought a home, give it a few weeks before you expect the name on the account to change.

Measure 50 and Your Oregon Assessed Value

Oregon assessments do not work the way many newcomers expect. Two ballot measures, Measure 5 in 1990 and Measure 50 in 1997, reshaped the system. Every property account now carries three values, and they are rarely the same number.

Real market value is the county's estimate of what your property would sell for on January 1 of the assessment year. Maximum assessed value is a lower figure that, by law, can grow by no more than 3 percent a year, apart from changes such as new construction. Assessed value is the smaller of those two, and it is the number your tax is calculated on.

This design has practical effects. Two neighbouring houses with the same market value can pay quite different taxes if one was last improved decades ago. A sharp rise in local home prices does not automatically raise your bill, because maximum assessed value acts as a brake. If market value falls below the maximum assessed value, your taxable value follows the lower figure.

Measure 5 adds a second limit. Tax on a property is capped at $5 per $1,000 of real market value for schools and $10 per $1,000 for general government. When the bill would exceed a cap, the rates are reduced, a process called compression. Whether it applies to you depends on the levies stacked on your parcel, so ask the assessor or tax collector.

The assessment date is January 1, and the tax year runs from July 1 to June 30. Tax statements are mailed in the fall. If a value looks wrong, the assessor's staff are the first people to ask, and many errors in square footage or property class are fixed with a simple conversation.

Metro Counties and Rural Offices in Oregon Work Differently

Oregon's geography shapes what a visit to the assessor feels like. In the Portland metro area and the Willamette Valley, offices handle thousands of subdivisions, condominiums and commercial buildings. The Washington County Assessor's Office at 155 North 1st Avenue in Hillsboro (503-846-8741) serves one of the state's most populous counties. The Lane County Assessor's Office at 125 East 8th Avenue in Eugene (541-682-4321) covers a university city plus large timber and farm holdings.

Central Oregon has its own pressures. The Deschutes County Assessor's Office at 1300 Northwest Wall Street in Bend (541-388-6508) works in a county where growth and new construction keep the roll changing. Owners there often ask about new-build valuation and how recent additions are added to maximum assessed value. You can browse the Deschutes County page for the office details we list.

Eastern and southeastern Oregon look very different. Harney County is the largest county in the state by area, and its assessor's office at 450 North Buena Vista Avenue in Burns (541-573-8365) deals mostly with ranches, rangeland and small-town parcels. Sherman County's office at 500 Court Street in Moro (541-565-3505) and Gilliam County's office at 221 South Oregon Street in Condon (541-384-3781) are small operations where one or two staff members may cover every task.

Wheeler County lists a mailing address, PO Box 447 in Fossil (541-763-4266), rather than a street address. For small counties like this, phone or mail is often the quickest route, and visits are best planned for weekday business hours.

The same rules govern all of these offices. What differs is staffing, how many services are online, and how long you may wait for an answer. Lane County and other larger counties tend to offer more online property search tools, while rural counties lean on counter service.

What to Bring When You Visit an Oregon Assessor

Preparation makes the visit short. Bring the property's account number or map and tax lot number, which appear on your tax statement. If you do not have either, the street address usually works, but the number removes any doubt about which parcel you mean.

For a value question, bring evidence. Useful items include a recent appraisal, a closing statement from a purchase, photographs of damage, or listings of comparable sales nearby. For an exemption or special assessment, bring the application form and proof of eligibility, such as a veteran's disability rating letter or farm income records. Most exemption applications are due April 15, so start early.

If you are changing a mailing address or adding a co-owner, ask whether the office wants a written request. Some counties accept an email or an online form, while others prefer a signed letter. Check your county's website or call the number listed on our county pages, then confirm opening hours before you travel to a courthouse.

Property assessor offices in Oregon operate under state property tax statutes that specify how properties must be valued, how often reappraisals occur, and what exemptions are available to qualifying homeowners. The state department of revenue or taxation typically provides oversight and technical guidance to county assessors to ensure consistent valuation practices statewide.

Assessor locations are available in 36 cities across Oregon. They are spread across 36 counties.

Cities with the highest concentration include Medford, Corvallis, Coquille, where high real estate activity and complex commercial properties create greater demand for assessor services and property valuation resources.

Property owners in Oregon should verify that their primary residence homestead exemption is active and confirm the annual appeal deadline with their local assessor office, as missing the deadline means waiting until the following tax year to contest a valuation.

Assessor by Counties

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Many county assessor offices in Oregon now offer online property search tools where homeowners can view their assessed value, recent sales history, and exemption status without visiting the office. If you have questions about a recent reassessment notice, calling or emailing the assessor's office is often the fastest way to get a response before filing a formal appeal.

Browse Assessor by county across Oregon to find the nearest location.

Key Dates and Contacts for Oregon Property Owners

Most assessor questions in Oregon follow a seasonal pattern. Values are set as of January 1. Exemption and special assessment applications are generally due April 15. Tax statements go out in October, and the first payment is due November 15. If you disagree with your value, the formal appeal window closes December 31.

Coastal and valley counties share this calendar with the high desert. In Astoria, the Clatsop County Assessor's Office at 820 Exchange Street (503-325-8522) fields calls about waterfront and tourism-related properties. In Albany, the Linn County Assessor at 300 Southwest 4th Avenue (541-967-3808) serves a mix of city lots and farmland. Corvallis is home to the Benton County Assessor's Office at 4077 Southwest Research Way (541-766-6855). See our Clatsop County, Linn County and Benton County pages for each listing.

Keep every notice the county sends you. A value notice, an exemption approval and your annual tax statement together show how the office reached your figures. If you ever need to challenge a number, those papers are your starting evidence. Always verify phone numbers and hours with the office directly, since counties change schedules and staffing.

Oregon Assessor FAQs

Go by the county where the property sits, not where you live. Oregon has 36 counties, and each assessor covers only parcels within its boundaries. A cabin in Wallowa County is handled by the Wallowa County Assessor's Office at 101 South River Street in Enterprise, even if you live in Portland. Your tax statement names the county and gives your account number. If you are unsure, look at the street address or map and tax lot number, then browse our county pages, such as Wallowa County, to find the office listing and phone number.

These three figures come from Measure 50 and appear on every Oregon tax statement. Real market value is the county's estimate of what the property would sell for on January 1. Maximum assessed value is a lower figure that can grow by only 3 percent a year, apart from items such as new construction. Assessed value is the lesser of the two, and your tax is calculated on it. Ask the assessor to explain how your numbers were reached. They can show you where the maximum assessed value began and what changed it.

Start by talking with the assessor's office, since many disputes end there. If that does not work, file a petition with your county's Board of Property Tax Appeals by December 31 of the tax year. The board is a panel that hears evidence and can change the real market value. If you still disagree afterward, you can appeal to the Oregon Tax Court, beginning in its Magistrate Division. Appeals focus on real market value, so gather comparable sales, an appraisal or photographs. Check the county's petition form for what to include.

The tax year runs from July 1 to June 30. You can pay in three installments due November 15, February 15 and May 15. Paying the full amount by November 15 earns a 3 percent discount, and paying two-thirds by that date earns a 2 percent discount. Payments go to the county tax collector, which in some counties is the same department as the assessor and in others is a separate office. Your tax statement lists the payment address and accepted methods. Interest is charged on late payments.

Yes, there are programs for both groups. Oregon offers a property tax exemption for qualifying disabled veterans, and you apply through the county assessor, normally by April 15 of the tax year. Seniors and some disabled homeowners may qualify for the Senior and Disabled Property Tax Deferral program, which lets the state pay your taxes and place a lien on the home. Income and other limits apply and can change, so confirm the current rules with your assessor or the Oregon Department of Revenue before filing.

No. Deeds are recorded by the county clerk, and building permits come from the local building department, which may be run by the county or by a city. The assessor receives information from both. A recorded sale prompts an ownership update, and a finished permit tells the office to appraise the new construction. If your deed is recorded but your name has not changed on the tax account after several weeks, call the assessor. For permit questions, contact the building department in your jurisdiction. Rural counties may handle some of these tasks in the same courthouse.