Property tax in Sioux County, Iowa
The median property tax bill in Sioux County, Iowa is $2,801 a year, which is about 1.12% of the county's median home value of $250,100. 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 Sioux County
Enter a home's market value for a ballpark at Sioux County's average effective rate of 1.12% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.
Estimated property tax: $2,801 / year
Property tax in Sioux County at a glance
| Measure | Value |
|---|---|
| Median annual property tax | $2,801 |
| Median home value | $250,100 |
| Effective tax rate | 1.12% |
| 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 Sioux County compare in Iowa?
Among Iowa's 99 counties, Sioux County has the 86th highest effective property-tax rate: 85 rank higher and 13 rank lower. That places it among the least taxed counties in the state. Nationally, it ranks 859th of 3135 US counties by effective rate. See every Iowa county ranked.
How much do homeowners in Sioux County actually pay?
The median is only the middle bill. Across Sioux County's 9,661 owner-occupied homes, 45% pay $3,000 or more a year in property tax, 67.8% pay at least $2,000, and 5.7% pay under $800.
| Annual bill | Homes | Share |
|---|---|---|
| Under $800 | 554 | 5.7% |
| $800 to $1,499 | 1,320 | 13.7% |
| $1,500 to $1,999 | 1,150 | 11.9% |
| $2,000 to $2,999 | 2,200 | 22.8% |
| $3,000 or more | 4,348 | 45% |
| No property tax paid | 89 | 0.9% |
Owners with a mortgage pay a median of $2,864 and owners without one pay $2,719. That is within 10% either way, so in Sioux County paying off the house does not go with a noticeably different bill. Census table B25103.
How does the Sioux County property tax bill compare with local incomes?
The median property tax bill of $2,801 is about 2.8% of the median income of Sioux County homeowner households, $100,191 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 76.1% of Sioux 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 Sioux County?
Yes. The median bill went from $2,014 in 2015-2019 to $2,801 in 2020-2024, a 39.1% rise. Over the same span the median home value moved 49.3%, from $167,500 to $250,100. 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 Sioux County
Sioux County borders 7 counties, 2 of them across the state line.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Lincoln County, SD | 1.15% | $3,990 | $348,300 |
| Osceola County, IA | 1.13% | $1,387 | $122,600 |
| Sioux County, IA (this county) | 1.12% | $2,801 | $250,100 |
| Union County, SD | 1.1% | $3,317 | $301,100 |
| Plymouth County, IA | 1.07% | $2,455 | $228,900 |
| Cherokee County, IA | 0.99% | $1,569 | $158,700 |
| O'Brien County, IA | 0.98% | $1,701 | $173,100 |
| Lyon County, IA | 0.87% | $1,995 | $230,000 |
How is a home assessed in Sioux County?
Iowa sets the assessment rules and Sioux County applies them. How Iowa assesses and reappraises homes.
Is there a homestead exemption in Sioux 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 Sioux County. Iowa's exemptions and relief programs in full.
When are property taxes due in Sioux 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. Sioux County issues and collects the bill, so the dates printed on your statement are the ones that bind you.
How to appeal your Sioux 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; Sioux 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
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How much house can I afford?
Your income, debts and down payment against the 28/36 rule lenders actually use, with Sioux County's tax rate to hand.
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Mortgage calculator
Monthly payment with principal, interest, tax and insurance, plus what an extra payment saves you.
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Iowa income tax
Brackets, standard deduction and what Iowa actually taxes.
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Sales tax in Sioux County
The other local tax: combined state and local rate for this county.
Sources
- Median real estate taxes paid and median home value for Sioux 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.