Sullivan County, IN Property Tax: $825/yr (2026)
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The effective property tax rate in Sullivan County is 0.68% of assessed home value. On a home at the county median value of $122,200, that works out to about $831 per year, or $69 per month. Sullivan County is located in western Indiana, and is home to approximately 20,766 residents.
About Sullivan County
Sullivan County covers approximately 447.2 square miles in Indiana. The county is home to about 20,766 residents living in roughly 8,798 housing units, of which 66.2% are owner-occupied. The median household income is $54,985, and the median home was built in 1972.
Sullivan County borders Clark County, Crawford County, Clay County, Greene County, Knox County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Indiana
Property taxes in Indiana 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 Indiana 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 Sullivan County Assessor's office to learn which exemptions apply to your property and when to file.
Sullivan County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Sullivan County, IN | 0.68% | $122,200 | $831 |
| Indiana state average | 0.67% | — | $819* |
| Clark County | 1.68% | $123,100 | $2,073 |
| Crawford County | 1.56% | $113,700 | $1,769 |
| Clay County | 0.46% | $128,900 | $589 |
| Greene County | 0.69% | $129,900 | $895 |
| Knox County | 0.72% | $123,500 | $895 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Sullivan County's median home value of $122,200. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Sullivan County's property tax rate compare to the rest of Indiana?
At 0.68%, Sullivan County is higher than the Indiana state average of 0.67%. On a home at the county median of $122,200, that means about $831 per year — versus $819 at the state average rate, a difference of $12 per year. Compared to the national average of 1.10%, Sullivan County is below average.
What's a typical annual property tax bill in Sullivan County?
For a home at the county median value of $122,200, the annual property tax in Sullivan County is approximately $831 — or about $69 per month. For a home worth $183,300, expect around $1,246 per year. For a $244,400 home, approximately $1,662 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Sullivan County property tax assessment?
Property assessment appeals in Sullivan County are handled by the Sullivan 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 Sullivan County?
Indiana 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 0.68% shown here. Contact the Sullivan 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