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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Sioux County, Iowa

Sioux County has an effective property tax rate of 1.12%. On the median home value of $250,100, that's roughly $2,801 per year. Median household income is $86,098.

Effective Property Tax Rate1
1.12%
median tax $2,801 ÷ median home $250,100
Median Home Value1
$250,100
owner-occupied
Median Household Income1
$86,098
per-capita $37,166
Est. Annual Tax on Median Home1
$2,801
at 1.12% effective rate

What you'll pay, at a glance

Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.

MetricSioux CountyIowa (state context)
Effective property tax rate11.12%1.32%
Median home value1$250,100—
State income tax3top rate 3.80%top rate 3.80%
State sales tax36.94% combined6.94% combined

How this is calculated

The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.

About Sioux County, IA

Property taxes in Sioux County, Iowa, run at an effective rate of 1.120%, which sits below the statewide median of 1.319%. Among Iowa's 99 counties, this places Sioux County at rank 86, meaning most counties in the state levy a higher rate. The gap with the national median of 0.794% is wider, though, and shows that homeowners here still pay more relative to property value than the average American. On a median home value of $250,100, the annual real-estate tax bill comes to about $2,801. With median household income at $86,098 and per-capita income of $37,166, that bill amounts to roughly 3.3% of household earnings. Communities such as Hawarden, Alton, and Chatsworth fall within the county, and the rate they share reflects a local tax environment that is comparatively gentle by Iowa standards but above the national baseline.

Frequently asked questions

What is the property tax rate in Sioux County, IA?
The effective rate is 1.12% — meaning the median tax bill equals about 1.12% of the median home value.
How much are property taxes on a median home?
On the median home ($250,100), the estimated annual bill is about $2,801.
Is Sioux County's rate high or low?
Compare it to the state median of 1.32% and the national average near 1.1%.
How does the effective rate differ from my mill rate?
A mill rate is the nominal levy per $1,000 of assessed value. The effective rate reflects what you actually pay after exemptions and assessments — it's the median tax bill as a share of median home value, so it better predicts your real cost.
Will a reassessment raise my tax bill?
Not necessarily. If your home's assessed value rises, your bill can go up, but only if the mill rate and exemptions stay flat. Contact the Sioux County assessor's office to review your current assessment.
Can I appeal my property tax assessment?
Yes. Most counties allow an appeal when you believe the assessed value exceeds the market value. File with the Sioux County assessor within the local deadline, typically with comparable sales as evidence.
Sources
[1] U.S. Census Bureau — ACS 5-Year (2023) — Median home value (B25077), median real-estate taxes (B25103), median household income (B19013), per-capita income (B19301).
[2] IRS — Statistics of Income — County income, AGI, and real-estate taxes paid.
[3] Tax Foundation — State income, sales, corporate, and estate/inheritance tax rates.