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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Plymouth County, Iowa

Plymouth County has an effective property tax rate of 1.07%. On the median home value of $228,900, that's roughly $2,455 per year. Median household income is $83,251.

Effective Property Tax Rate1
1.07%
median tax $2,455 ÷ median home $228,900
Median Home Value1
$228,900
owner-occupied
Median Household Income1
$83,251
per-capita $41,532
Est. Annual Tax on Median Home1
$2,455
at 1.07% 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.

MetricPlymouth CountyIowa (state context)
Effective property tax rate11.07%1.32%
Median home value1$228,900—
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 Plymouth County, IA

In Plymouth County, Iowa, the median home value sits at $228,900, and the annual real-estate tax bill on that home comes to about $2,455 — an effective rate of 1.073%. That rate lands below Iowa's statewide median of 1.319%, and the county ranks 92nd out of 99 for property tax rate within the state. Nationally, though, the picture flips: the U.S. median effective rate is 0.794%, so buyers here pay a higher share of home value in taxes than the country as a whole. Households earning the median income of $83,251 would owe roughly three percent of that in annual property taxes. Sioux City anchors the county as its largest community, alongside Akron and Brunsville. For anyone weighing a purchase, the combination of mid-range home prices and a below-state tax rate shapes the overall cost of owning here.

Frequently asked questions

What is the property tax rate in Plymouth County, IA?
The effective rate is 1.07% — meaning the median tax bill equals about 1.07% of the median home value.
How much are property taxes on a median home?
On the median home ($228,900), the estimated annual bill is about $2,455.
Is Plymouth 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 Plymouth 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 Plymouth 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.