Grays Harbor County, WA Property Tax: $2,441/yr (2026)
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The effective property tax rate in Grays Harbor County is 0.87% of assessed home value. On a home at the county median value of $279,500, that works out to about $2,432 per year, or $203 per month. Grays Harbor County is located in western Washington, with Montesano as its county seat, and is home to approximately 76,397 residents.
About Grays Harbor County
Grays Harbor County covers approximately 1,901.5 square miles in Washington. The county is home to about 76,397 residents living in roughly 36,568 housing units, of which 59.5% are owner-occupied. The median household income is $63,539, and the median home was built in 1974.
The county seat is Montesano. Grays Harbor County borders Jefferson County, Lewis County, Mason County, Pacific County, Thurston County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Washington
Property taxes in Washington 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 Washington 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 Grays Harbor County Assessor's office to learn which exemptions apply to your property and when to file.
Grays Harbor County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Grays Harbor County, WA | 0.87% | $279,500 | $2,432 |
| Washington state average | 0.76% | — | $2,124* |
| Jefferson County | 0.73% | $495,100 | $3,596 |
| Lewis County | 0.71% | $341,500 | $2,433 |
| Mason County | 0.75% | $377,400 | $2,833 |
| Pacific County | 0.82% | $274,000 | $2,250 |
| Thurston County | 0.90% | $451,500 | $4,043 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Grays Harbor County's median home value of $279,500. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Grays Harbor County's property tax rate compare to the rest of Washington?
At 0.87%, Grays Harbor County is higher than the Washington state average of 0.76%. On a home at the county median of $279,500, that means about $2,432 per year — versus $2,124 at the state average rate, a difference of $308 per year. Compared to the national average of 1.10%, Grays Harbor County is below average.
What's a typical annual property tax bill in Grays Harbor County?
For a home at the county median value of $279,500, the annual property tax in Grays Harbor County is approximately $2,432 — or about $203 per month. For a home worth $419,250, expect around $3,647 per year. For a $559,000 home, approximately $4,863 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Grays Harbor County property tax assessment?
Property assessment appeals in Grays Harbor County are handled by the Grays Harbor County Assessor's office in Montesano. 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 Grays Harbor County?
Washington 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 0.87% shown here. Contact the Grays Harbor 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