Demographics of Union County, South Carolina

Union County, South Carolina had 26,799 people on July 1, 2025, by the Census Bureau’s estimate: −374 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Union County, in four figures

26,799
Population: July 1, 2025, Vintage 2025 estimate.; −1.4%
Change since July 2020: −374 people.; 44.5 ±0.4
Median age: ACS 2020–⁠2024.; $41,621 ±$3,477
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Union County, South Carolina's population shrank 1.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Union County, South Carolina's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Union County, South Carolina's population shrank 1.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Union County, South Carolina's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	27,173	100.0	100.0
2021	27,028	99.5	100.2
2022	26,788	98.6	100.7
2023	26,781	98.6	101.6
2024	26,794	98.6	102.5
2025	26,799	98.6	103.1

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Population of Union County, South Carolina on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	27,173	−57	−41	0	−21
2021	27,028	−145	−232	+4	+59
2022	26,788	−240	−270	+16	+33
2023	26,781	−7	−195	+48	+141
2024	26,794	+13	−199	+89	+122
2025	26,799	+5	−207	+53	+158

Age, 2020–2024

The median age is 44.5 ±0.4: for men 42.7 ±1.8 and for women 45.8 ±0.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Union County by age, ACS 2020–2024
Age	People	Share	South Carolina	United States
Under 5	1,360 ±48	5.1% ±0.2	5.5% ±<0.1	5.6% ±<0.1
5 to 17	4,230 ±282	15.7% ±1.0	16.0% ±0.1	16.3% ±<0.1
18 to 24	1,919 ±267	7.1% ±1.0	9.1% ±0.1	9.1% ±<0.1
25 to 44	6,124 ±355	22.8% ±1.3	25.3% ±0.1	26.9% ±<0.1
45 to 64	7,442 ±358	27.7% ±1.3	25.2% ±0.1	24.8% ±<0.1
65 and over	5,810 ±409	21.6% ±1.5	18.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $41,621 ±$3,477, and income per person $27,229 ±$1,689, in 2024 dollars. The median is $69,324 ±$570 in South Carolina and $80,734 ±$166 in the United States.

Households by income

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Households in Union County by income, ACS 2020–2024
Household income	Households	Share	South Carolina	United States
Under $25,000	3,529 ±394	30.4% ±3.3	17.0% ±0.2	14.6% ±<0.1
$25,000 to $49,999	3,098 ±400	26.7% ±3.4	19.6% ±0.3	16.7% ±<0.1
$50,000 to $74,999	1,478 ±259	12.7% ±2.2	17.0% ±0.3	15.5% ±<0.1
$75,000 to $99,999	1,636 ±316	14.1% ±2.7	13.1% ±0.2	12.6% ±<0.1
$100,000 to $149,999	990 ±225	8.5% ±1.9	16.4% ±0.2	17.5% ±<0.1
$150,000 to $199,999	595 ±182	5.1% ±1.6	8.0% ±0.2	9.6% ±<0.1
$200,000 or more	285 ±105	2.5% ±0.9	8.9% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Union County by age, ACS 2020–2024
Age	Below poverty	Rate	South Carolina	United States
All ages	5,991 ±685	22.6% ±2.6	14.1% ±0.2	12.5% ±0.1
Under 18	1,980 ±325	36.1% ±4.9	19.4% ±0.4	16.1% ±0.1
18 to 59	2,684 ±386	20.1% ±2.8	13.1% ±0.2	11.6% ±0.1
60 and over	1,327 ±225	17.4% ±2.8	11.6% ±0.3	11.0% ±<0.1

Housing, 2020–2024

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Housing in Union County, ACS 2020–2024
Measure	Union County	South Carolina	United States
Housing units	13,527 ±29	2,443,039 ±311	143,775,355 ±10,234
Occupied	85.8% ±2.1	86.7% ±0.2	89.9% ±0.1
Vacant	14.2% ±2.1	13.3% ±0.2	10.1% ±0.1
Owner occupied	71.3% ±2.8	71.9% ±0.3	65.2% ±0.3
Renter occupied	28.7% ±3.2	28.1% ±0.3	34.8% ±0.1
Median home value	$103,600 ±$6,425	$259,000 ±$1,421	$332,700 ±$236
Median gross rent	$804 ±$142	$1,180 ±$9	$1,413 ±$2
Median year built	1972 ±2	1992 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Union County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	South Carolina	United States
Hispanic or Latino	559 ±0	2.1% ±<0.1	7.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	17,272 ±53	64.2% ±0.2	61.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	7,387 ±437	27.5% ±1.6	24.6% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	6 to 80	< 0.1% to 0.3%	1.7% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	15 to 147	0.1% to 0.5%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 15	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 87	0% to 0.3%	0.5% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,502 ±432	5.6% ±1.6	3.7% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Union County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	South Carolina	United States
Born in the state	21,603 ±595	80.4% ±2.2	52.6% ±0.2	57.3% ±<0.1
Born in another state	4,706 ±584	17.5% ±2.2	40.4% ±0.2	26.9% ±<0.1
Born a citizen outside the states	83 to 287	0.3% to 1.1%	1.2% ±0.1	1.7% ±<0.1
Born abroad	391 ±161	1.5% ±0.6	5.8% ±0.1	14.1% ±<0.1
Naturalized citizens	32 to 154	0.1% to 0.6%	2.6% ±0.1	7.4% ±<0.1
Not citizens	147 to 449	0.5% to 1.7%	3.2% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Union County among the counties of South Carolina

35th of 46 by population, July 2025. Every one is listed on the South Carolina page.

Counties of South Carolina near Union County in population, July 2025
County	July 2025	Change since 2020
Clarendon County	31,043	+0.7%
Edgefield County	29,808	+16.1%
Williamsburg County	29,662	−4.0%
Marion County	28,242	−2.9%
Dillon County	27,458	−2.9%
Union County	26,799	−1.4%
Marlboro County	25,488	−3.8%
Abbeville County	24,836	+2.3%
Barnwell County	20,653	+0.4%
Fairfield County	20,340	−2.6%
Saluda County	19,680	+4.0%

Elsewhere on the site

Rankings this appears in

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026