Gilliam County, OR Property Tax: $1,597/yr (2026)
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The effective property tax rate in Gilliam County is 1.01% of assessed home value. On a home at the county median value of $158,400, that works out to about $1,600 per year, or $133 per month. Gilliam County is located in central Oregon, and is home to approximately 2,002 residents.
About Gilliam County
Gilliam County covers approximately 1,204.7 square miles in Oregon. The county is home to about 2,002 residents living in roughly 1,111 housing units, of which 59.1% are owner-occupied. The median household income is $64,219, and the median home was built in 1958.
Gilliam County borders Morrow County, Sherman County, Wasco County, Wheeler County, Klickitat County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Oregon
Property taxes in Oregon are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in Oregon offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the Gilliam County Assessor's office to learn which exemptions apply to your property and when to file.
Gilliam County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Gilliam County, OR | 1.01% | $158,400 | $1,600 |
| Oregon state average | 0.78% | — | $1,236* |
| Morrow County | 0.82% | $229,800 | $1,885 |
| Sherman County | 0.69% | $206,700 | $1,436 |
| Wasco County | 0.84% | $332,500 | $2,784 |
| Wheeler County | 0.73% | $259,000 | $1,884 |
| Klickitat County | 0.62% | $388,700 | $2,401 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Gilliam County's median home value of $158,400. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Gilliam County's property tax rate compare to the rest of Oregon?
At 1.01%, Gilliam County is higher than the Oregon state average of 0.78%. On a home at the county median of $158,400, that means about $1,600 per year — versus $1,236 at the state average rate, a difference of $364 per year. Compared to the national average of 1.10%, Gilliam County is below average.
What's a typical annual property tax bill in Gilliam County?
For a home at the county median value of $158,400, the annual property tax in Gilliam County is approximately $1,600 — or about $133 per month. For a home worth $237,600, expect around $2,400 per year. For a $316,800 home, approximately $3,200 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Gilliam County property tax assessment?
Property assessment appeals in Gilliam County are handled by the Gilliam County Assessor's office. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in Gilliam County?
Oregon counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 1.01% shown here. Contact the Gilliam County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File