When are property taxes due in O'Brien County, IA?

2nd half April 1, 2027; 1st half October 1, 2027. This is the Iowa statutory schedule; confirm with the county.

How do I pay O'Brien County property tax?

Through the county website, www.obriencounty.com, or by post or in person at the treasurer's office.

How much is property tax on a $400,000 house in O'Brien County, IA?

About $3,812 a year, or $318 a month, at this county's effective rate of 0.95%. The rate is the county's median owner-occupied tax bill divided by the typical home value at the time; an exemption the seller holds usually does not transfer.

O'Brien County property tax due dates

O'Brien County, IA follows the Iowa statutory schedule. This page shows that schedule, the county's own website, and the late penalty — the county can still set its own dates, so confirm before you pay.

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…until 2nd half — April 1, 2027

Instalment	Due date	Notes
2nd half	April 1, 2027	Second half is payable through March 31 and delinquent April 1.
1st half	October 1, 2027	First half is payable through September 30; the statute makes it delinquent October 1.

O'Brien County website →

Schedule: www.legis.iowa.gov · Iowa statute · not yet county-verified

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Statewide schedule — read this before you rely on it

All 99 counties use the same October 1 and April 1 delinquency dates set in Iowa Code 445.37. Most counties in this state follow these dates.

Delinquent taxes accrue interest at 1.5% per month from the October 1 or April 1 delinquent date.

County treasurers mail tax statements after the levy is certified in the fall, with the first half due at the end of September.

O'Brien County at a glance

Population: 14,012 (Census estimate, 2023) — the 57th largest of 99 Iowa counties and county equivalents.
Typical tax bill: $1,491 a year (median for owner-occupied homes, ACS 2022 5-year estimate) — the Iowa median is $2,703.
Land area: 573 sq mi, about 24.5 people per sq mi.
County government: www.obriencounty.com.

What would the tax be on a house I buy here?

On a $400,000 purchase in O'Brien County, IA, property tax comes to about $3,812 a year — roughly $318 a month — at this county's effective rate of 0.95%.

Your purchase price

Effective rate 0.95% = this county's median owner-occupied tax bill ($1,491, ACS 2022 5-year estimate) divided by the typical home value at the time ($156,437, Zillow, 2022-12-31). Exemptions the seller holds — homestead, senior, veteran — usually do not transfer with the deed, so a new purchase can run above this figure. The county assessor sets the assessed value; this is an estimate, not a quote.

How to pay O'Brien County property tax

County website: www.obriencounty.com — start here for the treasurer or tax collector page.
By post: mail to the county treasurer; the postmark usually counts, not the arrival date.
In person: the treasurer's office, with your bill or parcel number.
Escrow: if your mortgage escrows taxes, the servicer pays — you still owe any shortfall.

Is this county verified?

Not yet. O'Brien County is on the queue: we publish a county's own published dates once they have been checked against the county website. Ask for it and it moves up. Until then, the Iowa statutory schedule above is the reliable starting point.

Larger Iowa counties nearby

More in Iowa

See all Iowa counties, or every upcoming deadline we track. If the bill is already a problem, read what happens if you don't pay and how to appeal an assessment.

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We try to keep every date current — but please double-check it with your county before you rely on it. CountyTaxDates is an independent reference, not a government agency. Each page shows the date we last checked it against the county's own schedule, and counties move deadlines, add instalments and grant extensions we may not have caught yet. If this page and your county disagree, your county is right. Confirm on the official site linked on every page before you pay or budget around a date, and tell us if something is out of date. Nothing here is tax, legal or financial advice.