Demographics of Union County, Tennessee

Union County, Tennessee had 21,450 people on July 1, 2025, by the Census Bureau’s estimate: +1,603 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

21,450
Population: July 1, 2025, Vintage 2025 estimate.; +8.1%
Change since July 2020: +1,603 people.; 42.7 ±0.7
Median age: ACS 2020–⁠2024.; $62,727 ±$3,883
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, Tennessee's population grew 8.1% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Union County, Tennessee'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).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Union County, Tennessee's population grew 8.1% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Union County, Tennessee'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	19,847	100.0	100.0
2021	20,020	100.9	100.2
2022	20,483	103.2	100.7
2023	20,760	104.6	101.6
2024	21,136	106.5	102.5
2025	21,450	108.1	103.1

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Population of Union County, Tennessee on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	19,847	+40	−37	0	+82
2021	20,020	+173	−119	0	+296
2022	20,483	+463	−117	−2	+554
2023	20,760	+277	−87	−2	+356
2024	21,136	+376	−56	−1	+433
2025	21,450	+314	−62	−4	+383

Age, 2020–2024

The median age is 42.7 ±0.7: for men 42.1 ±1.4 and for women 42.9 ±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	Tennessee	United States
Under 5	1,065 ±45	5.2% ±0.2	5.8% ±<0.1	5.6% ±<0.1
5 to 17	3,287 ±295	16.1% ±1.4	16.4% ±0.1	16.3% ±<0.1
18 to 24	1,479 ±200	7.2% ±1.0	8.9% ±0.1	9.1% ±<0.1
25 to 44	4,884 ±280	23.9% ±1.4	26.7% ±0.1	26.9% ±<0.1
45 to 64	5,867 ±347	28.7% ±1.7	25.2% ±0.1	24.8% ±<0.1
65 and over	3,849 ±366	18.8% ±1.8	17.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $62,727 ±$3,883, and income per person $29,443 ±$2,132, in 2024 dollars. The median is $69,595 ±$429 in Tennessee 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	Tennessee	United States
Under $25,000	1,680 ±300	21.2% ±3.7	16.6% ±0.2	14.6% ±<0.1
$25,000 to $49,999	1,686 ±283	21.3% ±3.5	19.4% ±0.2	16.7% ±<0.1
$50,000 to $74,999	1,276 ±242	16.1% ±3.0	17.3% ±0.2	15.5% ±<0.1
$75,000 to $99,999	1,231 ±193	15.5% ±2.4	13.2% ±0.2	12.6% ±<0.1
$100,000 to $149,999	1,154 ±277	14.6% ±3.5	16.8% ±0.2	17.5% ±<0.1
$150,000 to $199,999	565 ±210	7.1% ±2.6	7.7% ±0.1	9.6% ±<0.1
$200,000 or more	339 ±164	4.3% ±2.1	9.0% ±0.1	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	Tennessee	United States
All ages	2,787 ±496	13.8% ±2.5	13.8% ±0.2	12.5% ±0.1
Under 18	663 ±171	15.6% ±3.8	18.8% ±0.4	16.1% ±0.1
18 to 59	1,298 ±290	12.5% ±2.8	12.7% ±0.2	11.6% ±0.1
60 and over	826 ±199	14.8% ±3.4	11.4% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Union County, ACS 2020–2024
Measure	Union County	Tennessee	United States
Housing units	9,831 ±29	3,143,670 ±903	143,775,355 ±10,234
Occupied	80.7% ±2.9	89.8% ±0.2	89.9% ±0.1
Vacant	19.3% ±3.0	10.2% ±0.2	10.1% ±0.1
Owner occupied	80.2% ±3.3	66.9% ±0.3	65.2% ±0.3
Renter occupied	19.8% ±3.7	33.1% ±0.3	34.8% ±0.1
Median home value	$204,000 ±$15,444	$286,700 ±$1,492	$332,700 ±$236
Median gross rent	$847 ±$49	$1,189 ±$7	$1,413 ±$2
Median year built	1993 ±2	1987 ±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	Tennessee	United States
Hispanic or Latino	485 ±0	2.4% ±<0.1	7.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	19,213 ±163	94.0% ±0.8	71.0% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	14 to 126	0.1% to 0.6%	15.4% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 25	0% to 0.1%	1.9% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 26	0% to 0.1%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 26	0% to 0.1%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 50	0% to 0.2%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	632 ±164	3.1% ±0.8	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	Tennessee	United States
Born in the state	14,933 ±484	73.1% ±2.4	57.2% ±0.2	57.3% ±<0.1
Born in another state	5,228 ±470	25.6% ±2.3	35.7% ±0.2	26.9% ±<0.1
Born a citizen outside the states	165 ±81	0.8% ±0.4	1.0% ±<0.1	1.7% ±<0.1
Born abroad	32 to 178	0.2% to 0.9%	6.1% ±0.1	14.1% ±<0.1
Naturalized citizens	23 to 159	0.1% to 0.8%	2.4% ±0.1	7.4% ±<0.1
Not citizens	0 to 37	0% to 0.2%	3.7% ±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 Tennessee

66th of 95 by population, July 2025. Every one is listed on the Tennessee page.

Counties of Tennessee near Union County in population, July 2025
County	July 2025	Change since 2020
Lauderdale County	24,617	−2.0%
Overton County	23,787	+5.3%
Scott County	22,671	+3.6%
Morgan County	22,160	+5.3%
DeKalb County	21,873	+8.4%
Union County	21,450	+8.1%
Smith County	20,981	+5.1%
Fentress County	20,322	+9.7%
Humphreys County	19,646	+3.4%
Johnson County	18,718	+4.1%
Polk County	18,592	+5.9%

Elsewhere on the site

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

Data retrieved September 25, 2026