Sully County, SD Property Tax: $1,697/yr (2026)
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The effective property tax rate in Sully County is 0.85% of assessed home value. On a home at the county median value of $198,700, that works out to about $1,689 per year, or $141 per month. Sully County is located in central South Dakota, and is home to approximately 1,481 residents.
About Sully County
Sully County covers approximately 1,006.7 square miles in South Dakota. The county is home to about 1,481 residents living in roughly 908 housing units, of which 52.3% are owner-occupied. The median household income is $70,250, and the median home was built in 1975.
Sully County borders Dewey County, Hughes County, Hyde County, Potter County, Stanley County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in South Dakota
Property taxes in South Dakota are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in South Dakota offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the Sully County Assessor's office to learn which exemptions apply to your property and when to file.
Sully County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Sully County, SD | 0.85% | $198,700 | $1,689 |
| South Dakota state average | 1.09% | — | $2,166* |
| Dewey County | 1.34% | $75,400 | $1,009 |
| Hughes County | 1.14% | $221,100 | $2,526 |
| Hyde County | 1.23% | $134,500 | $1,650 |
| Potter County | 1.37% | $121,300 | $1,663 |
| Stanley County | 1.43% | $169,900 | $2,423 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Sully County's median home value of $198,700. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Sully County's property tax rate compare to the rest of South Dakota?
At 0.85%, Sully County is lower than the South Dakota state average of 1.09%. On a home at the county median of $198,700, that means about $1,689 per year — versus $2,166 at the state average rate, a difference of $477 per year. Compared to the national average of 1.10%, Sully County is below average.
What's a typical annual property tax bill in Sully County?
For a home at the county median value of $198,700, the annual property tax in Sully County is approximately $1,689 — or about $141 per month. For a home worth $298,050, expect around $2,533 per year. For a $397,400 home, approximately $3,378 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Sully County property tax assessment?
Property assessment appeals in Sully County are handled by the Sully County Assessor's office. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in Sully County?
South Dakota counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 0.85% shown here. Contact the Sully County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File