Union County, Tennessee Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 67th-largest in Tennessee
The population of Union County, Tennessee is 20,141 as of the 2023 American Community Survey, making it the 67th-largest county in Tennessee. The median household income is $61,858, the median home value is $186,300, and the median age is 42.4.
The population of Union County has grown 10.2% since 2010 (19,118 → 21,064), a +0.69% annualized rate.
20,141
Population
+0.69%
Annual growth
90
People / sq mi
$61,858
Median Income
$186,300
Median Home Value
Union County covers 224 sq mi of land at 90.1 people per square mile.
About Union County, TN
Union County is a county in Tennessee with a population of 20,141. It ranks #67 among counties in Tennessee by population. The median age is 42.4, older than the national median. The population is 49.9% male and 50.1% female.
The median household income in Union County is $61,858, below the US median of $74,580. 11.1% of residents live below the federal poverty level. Home values sit at a median of $186,300, with monthly rent averaging $849. The homeownership rate of 80.4% is higher than the national rate of 64.8%.
Educational attainment in Union County reflects 14.5% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 11.0% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 33.6 minutes each way.
Union County Population History (2010-2024)
The county of Union County had a population of 19,118 in 2010 and 21,064 in 2024, a 10.2% growth over 14 years. The peak was 21,064 in 2024. Average annual growth rate: 0.70%.
21,064
Population (2024)
19,118
Population (2010)
21,064
Peak (2024)
0.70%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 19,118 |
| 2011 | 19,193 |
| 2012 | 19,107 |
| 2013 | 19,064 |
| 2014 | 18,992 |
| 2015 | 19,159 |
| 2016 | 19,222 |
| 2017 | 19,394 |
| 2018 | 19,651 |
| 2019 | 19,936 |
| 2020 | 19,845 |
| 2021 | 20,018 |
| 2022 | 20,483 |
| 2023 | 20,747 |
| 2024 | 21,064 |
Race & Ethnicity
| White | 95.2% |
| Black or African American | 0.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
42.4
Median Age
50.1%
Female
49.9%
Male
18.4%
Age 65+
Age Distribution
Children (under 15): 17.3% · Seniors (65+): 18.4%
Income & Poverty
| Median household income | $61,858$-5,239 vs state |
| Mean household income | $76,005 |
| Per-capita income | $29,725 |
| Poverty rate | 11.1%+1.2% vs state |
| Unemployment rate | 2.2% |
| Employment-to-population | 52.5% |
Top Industries by Employment
The largest employment sector in Union County is professional & business services, accounting for 21.1% of workers.
How residents commute
0.0%
Drive alone
2.8%
Carpool
78.3%
Public transit
11.0%
Work from home
33.6 min
Avg commute
Housing
$186,300$-70,500 vs state
Median home value
$849
Median rent
80.4%
Homeownership rate
9,719
Total housing units
80.0%
Occupied
20.0%
Vacant
19.6%
Renter-occupied
Social & access
91.8%
With health insurance
90.4%
With broadband internet
27.3%
Foreign-born
6.4%
Veterans (18+)
21.5%
With a disability
98.1%
Speak language other than English at home
Education
83.3%
High School+
14.5%
Bachelor's+
Largest cities in Tennessee
Other counties in Tennessee
Part of Tennessee
Metro areas in Tennessee
County rankings
Frequently Asked Questions
Union County, Tennessee has a population of 20,141 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 67th-largest county in Tennessee. Population density is 90 people per square mile.
The population of Union County has grown 10.2% since 2010 (19,118 → 21,064), a +0.69% annualized rate.
The median household income in Union County, Tennessee is $61,858, with mean (average) household income of $76,005 and per-capita income of $29,725. 11.1% of residents live below the federal poverty level.
In Union County, the largest racial and ethnic groups are White (95.2%), Hispanic or Latino (1.3%), Black or African American (0.6%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Union County, Tennessee is 42.4 years. Residents are 50.1% female and 49.9% male.
The median home value in Union County is $186,300 and median monthly rent is $849. 80.4% of occupied housing units are owner-occupied. The county has 9,719 total housing units, 20.0% of which are vacant.
The largest employment sector in Union County, Tennessee is professional, scientific, and management services, employing 21.1% of workers. The unemployment rate is 2.2%.
Nashville-Davidson is among the largest cities associated with Union County, Tennessee, with a population of 684,298.
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Full rankings of Tennessee counties
Statewide data for Tennessee
Population, race, income, age, and trends across Tennessee
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.