Population
17,402
2025
+3.2% since 2020
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. Resident population, July 1 estimate.
Union County, SD: population growth, jobs and income
Union County gained 29 residents between 2024 and 2025 (+0.2%).
Union County had an estimated 17,402 residents in 2025, up 3.2% (547 more people) since 2020. That is slower than South Dakota as a whole (+5.3%), and the 18th fastest growth of 65 counties in South Dakota.
Data as of 2025 · updated
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In the Union County report
One-time $99 PDF: everything on this page for Union County, ranked against South Dakota and the U.S., plus these figures that are not on the free page:
- Median gross rent$1,069/mo2020–24
- Vacant homes, incl. seasonal and second homes3.7%2020–24
- New homes permitted, last 12 months2182025-10/2026-09
- Rent growth, 5 yearsIn the report
- Permits in 5+ unit buildingsIn the report
- IRS income moving in (net AGI)In the report
- Neighbouring-county comparison tableIn the report
What's inside: 5 pages
- 1 Summary, headline numbers and ranks (free preview)
- 2 Ranks and the neighbouring-county table
- 3 Migration, with IRS mover and income flows
- 4 Rent, vacant homes, permits and employers
- 5 Every source and the methods
Headline numbers
Net domestic migration
−115
2025
−6.6 per 1,000 residents
+148 in total, 2021–2025
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. People moving in from other U.S. counties minus people moving out.
Unemployment rate
2.1%
2025
−0.7 pts since 2019
Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics, 2025. Annual average unemployment rate.
New homes permitted
277
2025
+40.6% since 2021
15.9 per 1,000 residents
Source: U.S. Census Bureau, Building Permits Survey, 2025. Housing units authorized by building permits in the year.
Median household income
$89,636
2020–24
+21.1% since 2016–20
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–24. American Community Survey 5-year estimate.
Private-sector employment
9,844
2023
+10.4% since 2018
Source: U.S. Census Bureau, County Business Patterns, 2023. Paid employees of private employers in mid-March (County Business Patterns).
What the numbers say
Net domestic migration was negative in 2025: 115 more people moved out to other U.S. counties than moved in.
Private employers had 9,844 paid employees in mid-March 2023, +10.4% since 2018 (County Business Patterns).
Unemployment averaged 2.1% in 2025, 0.7 points lower than in 2019 (before the pandemic).
Builders were authorized to start 277 new homes in 2025, or 15.9 per 1,000 residents.
Median household income was $89,636 in the 2020–24 American Community Survey, +21.1% since 2016–20.
Across the 3,107 U.S. counties with a comparable estimate, its population growth ranks 919th.
Part of the Sioux City, IA-NE-SD metro area.
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Email me when Union County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Union County population by year
| Year | Population | Change |
|---|---|---|
| 2025 | 17,402 | +29 |
| 2024 | 17,373 | +224 |
| 2023 | 17,149 | +70 |
| 2022 | 17,079 | +198 |
| 2021 | 16,881 | +26 |
| 2020 | 16,855 | – |
Census Bureau population estimates, July 1 of each year.
What drove the change in Union County
Union County grew by 547 people since 2020; the largest part came from natural change (+238).
| Component | 2025 | 2020–25 | Share |
|---|---|---|---|
| Natural changebirths minus deaths | +104 | +238 | |
| International migrationfrom and to other countries | +39 | +155 | |
| Domestic migrationfrom and to other U.S. counties | −115 | +148 | |
| Census adjustmentbalancing residual | +1 | +6 | |
| Total change | +29 | +547 |
Census Bureau population estimates, components of change, each year July 1 to June 30. The components add up to the change in the estimate; the Census adjustment is the small balancing figure the Bureau publishes.
How it ranks
| Measure | In South Dakota | Among U.S. counties |
|---|---|---|
| Population growth | 18th of 65 | 919th of 3,107 |
| Net domestic migration per 1,000 residents | 48th of 65 | 2,703rd of 3,108 |
| Private-sector job growth | 14th of 65 | 656th of 3,092 |
| Median household income | 2nd of 65 | 310th of 3,107 |
| Lowest unemployment rate | 38th of 65 | 51st of 3,108 |
| New homes permitted per 1,000 residents | 2nd of 62 | 29th of 3,005 |
1st = highest (lowest for unemployment). Counties are ranked only against others with a figure for the same period.
Get the county report — $99
The County Growth and Demographics Report for Union County, SD as a PDF, from federal data: population and migration, housing and rents, permits, private employers and jobs, unemployment, ranks in the state and the country, and neighbouring counties, with a source next to every number. Pay once, no subscription.
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Neighbouring counties
Over 2020–25, Union County's population change (+3.2%) was ahead of 6 of its 7 neighbouring counties and behind 1 (Lincoln County).
Only Lincoln County had a higher median household income (2020–24) among its 7 neighbouring counties; Union County's was $89,636.
| County | Population2025 | Population change2020–25 | Net domestic migration per 1,000 residents2025 | Homes permitted per 1,000 residents2025 | Median household income2020–24 |
|---|---|---|---|---|---|
| Union County, SD This county | 17,402 | +3.2% | −6.6 | 15.9 | $89,636 |
| Clay County, SD | 15,031 | +0.2% | −12.1 | 1.4 | $56,850 |
| Dixon County, NE | 5,602 | +0.4% | −4.8 | 1.2 | $72,454 |
| Dakota County, NE | 21,687 | +0.7% | −8.4 | 2.0 | $70,329 |
| Plymouth County, IA | 25,697 | +0.0% | 0.3 | 1.8 | $83,251 |
| Lincoln County, SD | 77,145 | +17.5% | 20.3 | 3.0 | $99,166 |
| Sioux County, IA | 36,774 | +2.5% | −6.1 | 9.8 | $86,098 |
| Woodbury County, IA | 106,649 | +0.7% | −6.9 | 2.2 | $73,658 |
Census Bureau population estimates and building permits, American Community Survey 5-year income. Rates per 1,000 residents. – means no figure, or a base too small for a change or rate (it would swing on a few people). A figure from another period shows its year and is left out of the comparison.
Questions
Is Union County growing?
Yes. Its population grew 3.2% between 2020 and 2025, about 547 more people (Census Bureau population estimates). South Dakota as a whole changed +5.3% over the same years. That ranks 18th of 65 counties in South Dakota for population growth.
How many people moved to Union County?
On net, none in 2025: about 115 more people moved out to other U.S. counties than moved in (Census Bureau net domestic migration estimate).
What is the unemployment rate in Union County?
It averaged 2.1% in 2025 (BLS Local Area Unemployment Statistics, annual average).
What is the population of Union County?
About 17,402 people, according to the U.S. Census Bureau's population estimate for July 1, 2025.
How many jobs are in Union County?
Private employers there had 9,844 paid employees in mid-March 2023, +10.4% since 2018 (Census Bureau County Business Patterns; government jobs and the self-employed are not counted).
What Beacon CRE covers in South Dakota
Map, parcel and listing layers cover North and South Carolina only for now. This page and the other South Dakota county pages carry the public federal growth figures.
Union County data alerts
Email me when Union County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Sources and method
- U.S. Census Bureau, Population Estimates Program (Vintage 2025)
- U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics
- U.S. Census Bureau, Building Permits Survey
- U.S. Census Bureau, American Community Survey 5-year estimates
- U.S. Census Bureau, County Business Patterns
Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.
Jobs outside North and South Carolina use County Business Patterns (paid private-sector employees in mid-March); wages and government jobs are not included.