Union County, South Dakota
Union County, South Dakota · ZIP 51001, 51023, 57001
- Census data · ACS 2019-2023
- 17,402 (2024 estimate)Population
- 7,124Households
- $84,137Median household income
- $269,500Median home value
- 19Towns with a page
- 9ZIP codes
Union County in numbersOfficial sources, refreshed yearly
| Census | Population |
|---|---|
| 2000 | 12,584 |
| 2010 | 14,399 |
| 2020 | 16,811 |
As counted at each census, within the boundaries the area had then; the current estimate is in the glance card.
Sources: Census 2000 Summary File 1: total population, county level, state 46, retrieved November 14, 2026; Census 2010 Summary File 1: total population, county level, state 46, retrieved November 14, 2026; Census 2020 Redistricting Data (P.L. 94-171): total population, county level, state 46, retrieved November 14, 2026.
Median household income $84,137 · Share of households by income, American Community Survey 5-year 2019-2023, table S1901.
Source: American Community Survey 5-year subject table S1901 (household income) 2019–2023, county level, state 46, retrieved November 14, 2026.
- Owner occupied
- 5,077 units
- Renter occupied
- 2,047 units
- Vacancy rate
- 4.2%
Occupied housing units by tenure and the share of all units vacant, American Community Survey 5-year 2019-2023, table DP04.
Source: American Community Survey 5-year data profile 2019–2023, county level, state 46, retrieved November 14, 2026.
9,844 employees in 555 establishments with payroll in 2023, all sectors; employers themselves are not named in the source. County Business Patterns counts are published with noise.
Source: County Business Patterns 2023: employment by sector, county level, state 46, retrieved November 14, 2026.
| Measure | Union County | South Dakota |
|---|---|---|
| Population | 16,916 | 899,194 |
| Median household income | $84,137 | $72,421 |
| Median age | 40.4 | 37.7 |
| Median home value | $269,500 | $236,800 |
| Bachelor’s degree or higher | 36.5% | 31.1% |
| Foreign-born residents | 2.4% | 3.9% |
| Owner-occupied homes | 71.3% | 68.6% |
| Mean commute to work | 18.6 minutes | 17.6 minutes |
Source: American Community Survey 5-year data profile 2019–2023, county level, state 46, retrieved November 14, 2026.
Townships, towns and villages in Union County19 with a page · sort by any column
| Type | |||
|---|---|---|---|
| Big Sioux Township | Township | 5,145 | 10.8 sq mi |
| Dakota Dunes | Census designated place | 4,129 | 2.47 sq mi |
| North Sioux City | City | 3,059 | 3.34 sq mi |
| Beresford | City | 2,087 | 1.78 sq mi |
| Elk Point | City | 2,074 | 1.55 sq mi |
| Jefferson Township | Township | 1,209 | 38.8 sq mi |
| Alcester | City | 772 | 1.03 sq mi |
| Jefferson | City | 449 | 0.51 sq mi |
| Civil Bend Township | Township | 344 | 29.9 sq mi |
| Alcester Township | Township | 307 | 34.8 sq mi |
| Elk Point Township | Township | 283 | 55.3 sq mi |
| Big Springs Township | Township | 277 | 36.6 sq mi |
| Virginia Township | Township | 271 | 39.1 sq mi |
| Brule Township | Township | 267 | 36.3 sq mi |
| Prairie Township | Township | 254 | 34.7 sq mi |
| Sioux Valley Township | Township | 245 | 42.1 sq mi |
| Emmet Township | Township | 243 | 36.0 sq mi |
| Spink Township | Township | 232 | 36.3 sq mi |
| Richland | Census designated place | 168 | 5.65 sq mi |
Populations: Census Population Estimates, Vintage 2024: subcounty totals, state 46 (2024). Land areas: Census Gazetteer 2025: counties. A dash means the figure is not in the cited file.
County officialsFrom public records
No county official is published yet. Names appear once a researcher drafts them from the county’s own site and a second person approves; office contacts only, never personal details.
Across Union County
No job is posted in Union County’s towns yet. Employers post from their business dashboard; public job banks are added once their terms are recorded.
No upcoming event is listed in Union County's towns yet. Members and businesses add events from any town page.
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Neighboring counties
Neighboring counties
- Clay CountyPopulation 15,245 (2024 estimate)
- Dakota CountyPopulation 21,335 (2024 estimate)
- Dixon CountyPopulation 5,526 (2024 estimate)
- Lincoln CountyPopulation 75,244 (2024 estimate)
- Plymouth CountyPopulation 25,825 (2024 estimate)
- Sioux CountyPopulation 36,554 (2024 estimate)
- Woodbury CountyPopulation 107,257 (2024 estimate)
Sources: Census county adjacency file 2024, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 46, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 31, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 19, retrieved November 14, 2026.