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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Sully County, South Dakota

Sully County has an effective property tax rate of 0.83%. On the median home value of $205,400, that's roughly $1,715 per year. Median household income is $72,578.

Effective Property Tax Rate1
0.83%
median tax $1,715 ÷ median home $205,400
Median Home Value1
$205,400
owner-occupied
Median Household Income1
$72,578
per-capita $46,134
Est. Annual Tax on Median Home1
$1,715
at 0.83% 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.

MetricSully CountySouth Dakota (state context)
Effective property tax rate10.83%1.01%
Median home value1$205,400—
State income tax3No state income taxNo state income tax
State sales tax36.11% combined6.11% 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 Sully County, SD

Sully County, South Dakota, levies property taxes at an effective rate of 0.835%, which sits below the statewide median of 1.014% but slightly above the national median of 0.794%. That statewide gap matters: among South Dakota's 66 counties, this one ranks 57th, placing it near the lower end for tax rate. The median home in Sully County is valued at $205,400, generating an annual real-estate tax bill of about $1,715. Households here earn a median of $72,578, with per-capita income at $46,134. Agar is the principal town. Compared with South Dakota as a whole, homeowners in this county pay a smaller share of value in taxes, though the rate edges past the national figure. The ranking signals a county where property taxes take less from owners than in most of its state, even if it isn't the cheapest nationwide.

Frequently asked questions

What is the property tax rate in Sully County, SD?
The effective rate is 0.83% — meaning the median tax bill equals about 0.83% of the median home value.
How much are property taxes on a median home?
On the median home ($205,400), the estimated annual bill is about $1,715.
Is Sully County's rate high or low?
Compare it to the state median of 1.01% 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 Sully 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 Sully 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.