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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Petroleum County, Montana

Petroleum County has an effective property tax rate of 0.60%. On the median home value of $201,400, that's roughly $1,211 per year. Median household income is $60,208.

Effective Property Tax Rate1
0.60%
median tax $1,211 ÷ median home $201,400
Median Home Value1
$201,400
owner-occupied
Median Household Income1
$60,208
per-capita $39,919
Est. Annual Tax on Median Home1
$1,211
at 0.60% 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.

MetricPetroleum CountyMontana (state context)
Effective property tax rate10.60%0.68%
Median home value1$201,400—
State income tax3top rate 5.65%top rate 5.65%
State sales tax30.00% combined0.00% 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 Petroleum County, MT

Buying a home in Petroleum County, Montana, comes with a property tax rate of 0.601%, which sits below Montana's statewide median of 0.677% and well under the national median of 0.794%. That rate applies to a median home value of $201,400, producing an annual real-estate tax bill of about $1,211. Set against a median household income of $60,208, the yearly tax equals roughly two percent of what a household here earns. Winnett, the county's principal town, anchors a place where home prices stay far below what buyers face in many larger markets, and the tax rate itself ranks 36th among Montana's 56 counties. Per-capita income reaches $39,919. Someone weighing a purchase here would find both the entry price and the ongoing tax cost comparatively gentle.

Frequently asked questions

What is the property tax rate in Petroleum County, MT?
The effective rate is 0.60% — meaning the median tax bill equals about 0.60% of the median home value.
How much are property taxes on a median home?
On the median home ($201,400), the estimated annual bill is about $1,211.
Is Petroleum County's rate high or low?
Compare it to the state median of 0.68% 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 Petroleum 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 Petroleum 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.