Property tax in Washington County, Oklahoma

By Brent Chudoba, editor Updated September 23, 2026

The median property tax bill in Washington County, Oklahoma is $1,558 a year, which is about 0.9% of the county's median home value of $173,200. That effective rate is higher than the typical Oklahoma county (0.63%) and higher than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.

Estimate the property tax on a home in Washington County

Enter a home's market value for a ballpark at Washington County's average effective rate of 0.9% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.

Home market value

Estimated property tax: $1,559 / year

Property tax in Washington County at a glance

Washington County, Oklahoma property tax (Census ACS, reviewed September 23, 2026)
Measure	Value
Median annual property tax	$1,558
Median home value	$173,200
Effective tax rate	0.9%
Typical Oklahoma county rate	0.63%
National median county rate	0.81%

Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.

How does Washington County compare in Oklahoma?

Among Oklahoma's 77 counties, Washington County has the 5th highest effective property-tax rate: 4 rank higher and 72 rank lower. That places it among the most heavily taxed counties in the state. Nationally, it ranks 1360th of 3135 US counties by effective rate. See every Oklahoma county ranked.

How much do homeowners in Washington County actually pay?

The median is only the middle bill. Across Washington County's 15,061 owner-occupied homes, 19.4% pay $3,000 or more a year in property tax, 37.2% pay at least $2,000, and 23.1% pay under $800. Another 5.8% report paying no property tax at all, which usually means an exemption covers the whole bill.

Annual property tax paid by Washington County homeowners (Census ACS 2020-2024)
Annual bill	Homes	Share
Under $800	3,478	23.1%
$800 to $1,499	3,419	22.7%
$1,500 to $1,999	1,703	11.3%
$2,000 to $2,999	2,674	17.8%
$3,000 or more	2,917	19.4%
No property tax paid	870	5.8%

Owners with a mortgage pay a median of $1,890 and owners without one pay $1,228. Owners who have paid off a home have usually held it longer, and in states that cap how fast an existing owner's assessment can rise, long-held homes carry lower assessed values. Census table B25103.

How does the Washington County property tax bill compare with local incomes?

The median property tax bill of $1,558 is about 2% of the median income of Washington County homeowner households, $76,231 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 71.9% of Washington County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.

Have property taxes gone up in Washington County?

Yes. The median bill went from $1,149 in 2015-2019 to $1,558 in 2020-2024, a 35.6% rise. Over the same span the median home value moved 43.6%, from $120,600 to $173,200. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.

Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.

Property tax in counties next to Washington County

Washington County borders 6 counties, 2 of them across the state line.

Washington County and its neighbors, highest effective rate first (Census ACS 2020-2024)
County	Effective rate	Median bill	Median home value
Montgomery County, KS	1.72%	$1,754	$101,700
Chautauqua County, KS	1.51%	$991	$65,500
Tulsa County, OK	0.97%	$2,227	$230,400
Washington County, OK (this county)	0.9%	$1,558	$173,200
Rogers County, OK	0.75%	$1,806	$240,500
Osage County, OK	0.69%	$1,248	$182,100
Nowata County, OK	0.65%	$891	$137,800

How is a home assessed in Washington County?

Oklahoma sets the assessment rules and Washington County applies them. How Oklahoma assesses and reappraises homes.

Is there a homestead exemption in Washington County?

Yes, but it is small. Oklahoma's homestead exemption is $1,000 of assessed value, usually worth around $80 to $130 a year. Apply once on Form 921 with the county assessor by March 15. That is the Oklahoma rule, and it applies in Washington County. Oklahoma's exemptions and relief programs in full.

When are property taxes due in Washington County?

Tax becomes due November 1. Pay the whole bill, or at least half of it, before January 1; if you pay nothing by then the entire year goes delinquent on January 1. If you paid the first half on time, the second half is due before April 1. Unpaid tax accrues 1.5% a month until the interest equals the tax itself.

Oklahoma splits the bill into 2 installments. That is the Oklahoma rule. Washington County issues and collects the bill, so the dates printed on your statement are the ones that bind you.

How to appeal your Washington County property assessment

You contest the assessed value with the County assessor (informal protest), then the county board of equalization. The filing deadline is typically 30 days from the date your valuation increase notice was mailed. That is the Oklahoma rule; Washington County sets the exact dates and forms. The Oklahoma appeal process step by step.

Oklahoma rules from primary state sources, reviewed September 7, 2026; sources on the Oklahoma page.

Work out your own numbers

Sources

Median real estate taxes paid and median home value for Washington County, Oklahoma: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.