O'Brien County, IA Property Tax: $1,572/yr (2026)
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The effective property tax rate in O'Brien County is 0.99% of assessed home value. On a home at the county median value of $158,900, that works out to about $1,573 per year, or $131 per month. O'Brien County is located in northwestern Iowa, and is home to approximately 14,103 residents.
About O'Brien County
O'Brien County covers approximately 573.0 square miles in Iowa. The county is home to about 14,103 residents living in roughly 6,544 housing units, of which 68.4% are owner-occupied. The median household income is $68,216, and the median home was built in 1959.
O'Brien County borders Buena Vista County, Cherokee County, Clay County, Dickinson County, Lyon County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Iowa
Property taxes in Iowa 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 Iowa 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 O'Brien County Assessor's office to learn which exemptions apply to your property and when to file.
O'Brien County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| O'Brien County, IA | 0.99% | $158,900 | $1,573 |
| Iowa state average | 1.34% | — | $2,129* |
| Buena Vista County | 1.24% | $146,900 | $1,822 |
| Cherokee County | 1.08% | $145,100 | $1,561 |
| Clay County | 1.18% | $171,500 | $2,028 |
| Dickinson County | 0.98% | $251,600 | $2,458 |
| Lyon County | 0.92% | $215,600 | $1,983 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at O'Brien County's median home value of $158,900. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does O'Brien County's property tax rate compare to the rest of Iowa?
At 0.99%, O'Brien County is lower than the Iowa state average of 1.34%. On a home at the county median of $158,900, that means about $1,573 per year — versus $2,129 at the state average rate, a difference of $556 per year. Compared to the national average of 1.10%, O'Brien County is below average.
What's a typical annual property tax bill in O'Brien County?
For a home at the county median value of $158,900, the annual property tax in O'Brien County is approximately $1,573 — or about $131 per month. For a home worth $238,350, expect around $2,360 per year. For a $317,800 home, approximately $3,146 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a O'Brien County property tax assessment?
Property assessment appeals in O'Brien County are handled by the O'Brien 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 O'Brien County?
Iowa 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 0.99% shown here. Contact the O'Brien 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