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 defined demographically by education — 14.5% of adults hold a bachelor’s degree, below the national average. Union County is a county in Tennessee with a population of 20,141.
The typical household here earns about $61,858, below the US median of $78,538. Poverty runs at 11.1%, below the national 12.4%. Homes carry a median value of $186,300, with typical rent around $849.
Fewer adults hold degrees here than in most comparable places — 14.5%, below the national 35.0%. About 11.0% of workers primarily work from home, below the national 14.0%, and the average commute runs about 34 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.
Union County, TN Climate
Union County, TN has an average annual temperature of 13.5°C (56°F) and receives about 1236 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
13.5°C
Avg Temp
1236
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 2° / 36° | 102 mm |
| February | 4° / 39° | 97 mm |
| March | 8° / 47° | 123 mm |
| April | 13° / 55° | 99 mm |
| May | 18° / 64° | 120 mm |
| June | 22° / 71° | 106 mm |
| July | 24° / 75° | 117 mm |
| August | 24° / 74° | 103 mm |
| September | 21° / 69° | 85 mm |
| October | 14° / 58° | 78 mm |
| November | 9° / 48° | 100 mm |
| December | 4° / 40° | 106 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Union County, TN
The most comfortable months to visit Union County, TN are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -4°C low). March is usually the wettest month.
Where to stay near Union County
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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.