Union County, SD Property Taxes (2026)

Union County owners pay a median of $2,997 a year on a median home value of $269,500, an effective rate of 1.11%. That's the 28th-highest rate of 65 South Dakota counties with Census data, above the South Dakota county median of 1.08%.

Updated October 2026 · Data: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023)

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Effective tax rate

1.11%

28th highest of 65 in SD

Median annual bill

$2,997

~$250/month

Median home value

$269,500

South Dakota county median

1.08%

Effective rate

What a protest could save you in Union County

Enter the market value from your appraisal notice. We apply Union County's 1.11% effective rate and a 10–15% reduction, the typical range for successful protests.

$
Est. annual tax
$2,991
Savings at 10–15% off
$299–$449
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Union County vs. South Dakota vs. U.S. property tax rates

Union County1.11%
South Dakota county median1.08%
U.S. county median0.84%

Key stat: Union County's effective property tax rate is 1.11%, vs. 1.08% for the median South Dakota county and 0.84% for the median U.S. county. It ranks 28th of 65 in South Dakota. Effective rate = median tax bill ÷ median home value, so it already reflects typical exemptions. (Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023))

How to appeal your property taxes in Union County

  1. 1

    Review your assessment notice

    Check the assessed value from the Union County Director of Equalization. Compare it to recent sales of similar homes nearby.

  2. 2

    File your appeal before the deadline

    The Union County deadline is Varies by county. Missing it means waiting until the next assessment year.

  3. 3

    Gather evidence

    Recent comparable sales, photos of condition issues, repair estimates or an independent appraisal.

  4. 4

    Present your case

    Submit evidence or attend a hearing with the County Director of Equalization.

  5. 5

    Get your decision

    If you win, your assessed value and bill go down. On a $2,997 bill, 10–15% off is $300–$450 a year.

Want help with it?

TaxDrop builds your case from comparable sales data.

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Property tax exemptions in South Dakota

South Dakota homeowners may qualify for exemptions that reduce taxable value. Check with the Union County Director of Equalization for amounts.

Homestead exemption

For your primary residence. Reduces the value used to calculate your bill.

Senior / over-65

Many states add an exemption or freeze for owners 65 and older.

Disability

For homeowners with qualifying disabilities, often similar to the over-65 benefit.

Veterans

Disabled veterans may get partial or full exemptions depending on rating.

Frequently Asked Questions

What is the property tax rate in Union County, South Dakota?
The median effective property tax rate in Union County is 1.11%: a median annual bill of $2,997 on a median home value of $269,500. That's the 28th-highest rate of 65 South Dakota counties with Census data. Your own rate depends on which city, school district and special districts you're in. Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023).
How much are property taxes in Union County?
The median Union County property tax bill is $2,997 a year, about $250 a month, compared with a South Dakota county median of $1,598.
What is the deadline to appeal property taxes in Union County?
The deadline to appeal in Union County is Varies by county. Missing it means waiting until the next assessment cycle.
Is Union County a high property tax area?
Union County's 1.11% effective rate is above the South Dakota county median of 1.08% and above the U.S. county median of 0.84%. That's the 28th-highest rate of 65 South Dakota counties with Census data.
Can TaxDrop help lower my Union County property taxes?
TaxDrop analyzes your property against local comparable sales and helps you appeal your assessment.

Property taxes in nearby counties

Clay County

Rate: 1.30%

Median bill: $2,879

Lincoln County

Rate: 1.18%

Median bill: $3,822

Yankton County

Rate: 1.13%

Median bill: $2,347

Turner County

Rate: 1.04%

Median bill: $2,072

Minnehaha County

Rate: 1.16%

Median bill: $3,090

Bon Homme County

Rate: 1.25%

Median bill: $1,499

Hutchinson County

Rate: 1.12%

Median bill: $1,793

McCook County

Rate: 0.98%

Median bill: $2,133

← All 65 South Dakota counties

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