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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Monona County, Iowa

Monona County has an effective property tax rate of 1.03%. On the median home value of $142,900, that's roughly $1,467 per year. Median household income is $68,377.

Effective Property Tax Rate1
1.03%
median tax $1,467 ÷ median home $142,900
Median Home Value1
$142,900
owner-occupied
Median Household Income1
$68,377
per-capita $35,795
Est. Annual Tax on Median Home1
$1,467
at 1.03% 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.

MetricMonona CountyIowa (state context)
Effective property tax rate11.03%1.32%
Median home value1$142,900—
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 Monona County, IA

Buying in Monona County, Iowa, comes with a lower tax load than much of the state. The effective property tax rate here is 1.027%, below Iowa's statewide median of 1.319%, and the county ranks 93rd out of 99 for property tax rate. On a median home value of $142,900, that works out to an annual real-estate tax bill of about $1,467. Households here bring in a median income of $68,377, with per-capita income at $35,795. Compare the tax rate to the national median of 0.794% and Monona County sits higher, so buyers weighing a move should factor that in alongside the affordable home prices. Onawa is the largest of the county's towns, which also include Castana and Rodney. For someone seeking low entry costs on a house, the combination of a below-state-average rate and inexpensive housing stock makes this corner of western Iowa worth a look.

Frequently asked questions

What is the property tax rate in Monona County, IA?
The effective rate is 1.03% — meaning the median tax bill equals about 1.03% of the median home value.
How much are property taxes on a median home?
On the median home ($142,900), the estimated annual bill is about $1,467.
Is Monona 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 Monona 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 Monona 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.