Property tax in O'Brien County, Iowa

By Brent Chudoba, editor Updated September 23, 2026

The median property tax bill in O'Brien County, Iowa is $1,701 a year, which is about 0.98% of the county's median home value of $173,100. That effective rate is lower than the typical Iowa county (1.32%) 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 O'Brien County

Enter a home's market value for a ballpark at O'Brien County's average effective rate of 0.98% (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: $1,696 / year

Property tax in O'Brien County at a glance

O'Brien County, Iowa property tax (Census ACS, reviewed September 23, 2026)
Measure	Value
Median annual property tax	$1,701
Median home value	$173,100
Effective tax rate	0.98%
Typical Iowa county rate	1.32%
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 O'Brien County compare in Iowa?

Among Iowa's 99 counties, O'Brien County has the 97th highest effective property-tax rate: 96 rank higher and 2 rank lower. That places it among the least taxed counties in the state. Nationally, it ranks 1166th of 3135 US counties by effective rate. See every Iowa county ranked.

How much do homeowners in O'Brien County actually pay?

The median is only the middle bill. Across O'Brien County's 4,421 owner-occupied homes, 21.8% pay $3,000 or more a year in property tax, 40.4% pay at least $2,000, and 18.8% pay under $800.

Annual property tax paid by O'Brien County homeowners (Census ACS 2020-2024)
Annual bill	Homes	Share
Under $800	831	18.8%
$800 to $1,499	1,089	24.6%
$1,500 to $1,999	687	15.5%
$2,000 to $2,999	822	18.6%
$3,000 or more	964	21.8%
No property tax paid	28	0.6%

Owners with a mortgage pay a median of $1,891 and owners without one pay $1,545. 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 O'Brien County property tax bill compare with local incomes?

The median property tax bill of $1,701 is about 2% of the median income of O'Brien County homeowner households, $85,381 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 76.1% of O'Brien 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 O'Brien County?

Yes. The median bill went from $1,360 in 2015-2019 to $1,701 in 2020-2024, a 25.1% rise. Over the same span the median home value moved 61.8%, from $107,000 to $173,100. 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 O'Brien County

O'Brien County borders 8 counties.

O'Brien County and its neighbors, highest effective rate first (Census ACS 2020-2024)
County	Effective rate	Median bill	Median home value
Buena Vista County, IA	1.21%	$1,931	$159,500
Clay County, IA	1.15%	$2,050	$178,600
Osceola County, IA	1.13%	$1,387	$122,600
Sioux County, IA	1.12%	$2,801	$250,100
Plymouth County, IA	1.07%	$2,455	$228,900
Cherokee County, IA	0.99%	$1,569	$158,700
O'Brien County, IA (this county)	0.98%	$1,701	$173,100
Dickinson County, IA	0.92%	$2,503	$270,700
Lyon County, IA	0.87%	$1,995	$230,000

How is a home assessed in O'Brien County?

Iowa sets the assessment rules and O'Brien County applies them. How Iowa assesses and reappraises homes.

Is there a homestead exemption in O'Brien County?

Yes. From the 2026 assessment year Iowa exempts 10% of a homestead's taxable value, never less than $5,500 or more than $20,000. File form 54-028 with your assessor by July 1. That is the Iowa rule, and it applies in O'Brien County. Iowa's exemptions and relief programs in full.

When are property taxes due in O'Brien County?

Iowa bills for a fiscal year running July 1 to June 30 and you pay the county treasurer in two halves, the first by September 30 and the second by March 31. The statute technically says pay before September 1 and March 1, but nothing goes delinquent and no interest accrues until October 1 and April 1, which is why counties advertise the end of September and March as the real deadlines. If the last day lands on a weekend you have until the second business day of the following month.

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

How to appeal your O'Brien County property assessment

You contest the assessed value with the your local board of review, then the Property Assessment Appeal Board or district court. The filing deadline is typically April 30, with protests accepted from April 2 onward. That is the Iowa rule; O'Brien County sets the exact dates and forms. The Iowa appeal process step by step.

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

Work out your own numbers

Sources

Median real estate taxes paid and median home value for O'Brien County, Iowa: 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.