Union County, SD Property Tax Rate
Homeowners in Union County pay an effective 1.11% of home value in property tax — about $2,991 a year on the median $269,500 home, above the South Dakota county median of 1.08%.
Union County, SD: 1.11% effective property tax — ~$2,991/yr on the median home.
- Effective rate1.11%
- Median home value$269,500
- Median annual bill$2,991
- SD county median1.08%
- U.S. county median0.84%
Source: U.S. Census ACS 2023 5-year (median taxes paid ÷ median value), compiled June 2026.
Union County vs. South Dakota and the U.S.
| Effective rate | On the county's $269,500 median home | |
|---|---|---|
| Union County | 1.11% | $2,991 |
| South Dakota county median | 1.08% | $2,911 |
| U.S. county median | 0.84% | $2,264 |
Median household income here is $84,137, putting the median tax bill at about 3.6% of income. Effective rates fold in homestead exemptions and assessment practice — they're what owners actually pay, which is why they beat statutory rates for comparison.
Highest & lowest rates in South Dakota
| County | Effective rate | Median bill |
|---|---|---|
| Todd County | 2.23% | $1,008 |
| McPherson County | 1.55% | $1,215 |
| Mellette County | 1.53% | $964 |
| Walworth County | 1.44% | $1,872 |
| Oglala Lakota County | 0.44% | $201 |
| Ziebach County | 0.59% | $600 |
| Faulk County | 0.76% | $943 |
| Buffalo County | 0.78% | $842 |
Full picture: South Dakota property tax calculator · interactive county atlas · all county pages.
Frequently asked questions
What is the property tax rate in Union County, SD?
The effective rate is about 1.11% of home value — the median homeowner pays roughly $2,991 a year on a $269,500 median home (ACS 2023 five-year data).
Is Union County's property tax high?
It's above the South Dakota county median (1.08%) and above the U.S. county median (0.84%).
How is the effective rate calculated?
Median real-estate taxes paid ÷ median home value, from the Census American Community Survey — what owners actually pay, after exemptions, rather than the statutory millage.
Sources & methodology
Sources: Census ACS 2023 5-year tables B25103/B25077.
Effective rate = median real-estate taxes ÷ median home value (owner-occupied). Individual bills vary with exemptions, assessment timing and local levies — verify with the county assessor.