Union County, Ohio Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 37th-largest in Ohio
The population of Union County, Ohio is 65,293 as of the 2023 American Community Survey, making it the 37th-largest county in Ohio. The median household income is $109,506, the median home value is $306,600, and the median age is 38.1.
The population of Union County has grown 36.7% since 2010 (52,462 → 71,721), a +2.26% annualized rate.
65,293
Population
+2.26%
Annual growth
151
People / sq mi
$109,506
Median Income
$306,600
Median Home Value
Union County covers 432 sq mi of land at 151.2 people per square mile.
About Union County, OH
What sets Union County apart is money: median household income runs $109,506, above the US median of $78,538. With 65,293 residents, Union County is a county in Ohio. It ranks #37 among counties in Ohio by population.
Earnings sit at the high end: a median household income of $109,506, above the US median of $78,538. Hardship is rare relative to US counties: a poverty rate of just 3.9%, below the national 12.4%. The median home value is $306,600, with typical rent around $1,188.
Union County is among the best-educated US counties: 39.1% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Remote work is widespread — 19.9% of workers stay home, above the national 14.0%, and the average commute runs about 27 minutes each way.
Taken together, the income and housing figures place Union County firmly in the higher-cost, higher-earning tier of US counties — a profile that tends to track dense job markets and competitive housing.
Union County Population History (2010-2024)
The county of Union County had a population of 52,462 in 2010 and 71,721 in 2024, a 36.7% growth over 14 years. The peak was 71,721 in 2024. Average annual growth rate: 2.27%.
71,721
Population (2024)
52,462
Population (2010)
71,721
Peak (2024)
2.27%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 52,462 |
| 2011 | 53,101 |
| 2012 | 52,798 |
| 2013 | 53,440 |
| 2014 | 53,782 |
| 2015 | 54,394 |
| 2016 | 55,601 |
| 2017 | 56,842 |
| 2018 | 57,836 |
| 2019 | 59,054 |
| 2020 | 63,090 |
| 2021 | 65,119 |
| 2022 | 66,927 |
| 2023 | 69,765 |
| 2024 | 71,721 |
Race & Ethnicity
| White | 86.6% |
| Black or African American | 2.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.9% |
| Two or More Races | 0.0% |
Age & Sex
38.1
Median Age
51.6%
Female
48.4%
Male
13.0%
Age 65+
Age Distribution
Children (under 15): 19.9% · Seniors (65+): 13.0%
Income & Poverty
| Median household income | $109,506+$39,826 vs state |
| Mean household income | $134,832 |
| Per-capita income | $49,946 |
| Poverty rate | 3.9%-5.3% vs state |
| Unemployment rate | 1.6% |
| Employment-to-population | 66.8% |
Top Industries by Employment
The largest employment sector in Union County is professional & business services, accounting for 21.4% of workers.
How residents commute
0.6%
Drive alone
0.5%
Carpool
71.8%
Public transit
19.9%
Work from home
26.5 min
Avg commute
Housing
$306,600+$107,400 vs state
Median home value
$1,188
Median rent
79.4%
Homeownership rate
24,298
Total housing units
96.7%
Occupied
3.3%
Vacant
20.6%
Renter-occupied
Social & access
95.7%
With health insurance
96.6%
With broadband internet
18.3%
Foreign-born
5.8%
Veterans (18+)
10.6%
With a disability
92.2%
Speak language other than English at home
Education
95.2%
High School+
39.1%
Bachelor's+
Largest cities in Ohio
Other counties in Ohio
Part of Ohio
Metro areas in Ohio
County rankings
Frequently Asked Questions
Union County, Ohio has a population of 65,293 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 37th-largest county in Ohio. Population density is 151 people per square mile.
The population of Union County has grown 36.7% since 2010 (52,462 → 71,721), a +2.26% annualized rate.
The median household income in Union County, Ohio is $109,506, with mean (average) household income of $134,832 and per-capita income of $49,946. 3.9% of residents live below the federal poverty level.
In Union County, the largest racial and ethnic groups are White (86.6%), Black or African American (2.4%), Hispanic or Latino (1.9%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Union County, Ohio is 38.1 years. Residents are 51.6% female and 48.4% male.
The median home value in Union County is $306,600 and median monthly rent is $1,188. 79.4% of occupied housing units are owner-occupied. The county has 24,298 total housing units, 3.3% of which are vacant.
The largest employment sector in Union County, Ohio is professional, scientific, and management services, employing 21.4% of workers. The unemployment rate is 1.6%.
Columbus is among the largest cities associated with Union County, Ohio, with a population of 906,480.
Union County, OH Climate
Union County, OH has an average annual temperature of 10.2°C (50°F) and receives about 923 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
10.2°C
Avg Temp
923
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -4° / 25° | 52 mm |
| February | -2° / 28° | 49 mm |
| March | 4° / 39° | 74 mm |
| April | 9° / 49° | 87 mm |
| May | 15° / 60° | 99 mm |
| June | 20° / 69° | 98 mm |
| July | 23° / 73° | 99 mm |
| August | 22° / 71° | 85 mm |
| September | 18° / 64° | 74 mm |
| October | 12° / 53° | 61 mm |
| November | 6° / 42° | 76 mm |
| December | 0° / 31° | 69 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, OH
The most comfortable months to visit Union County, OH are typically August, June and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -8°C low). May is usually the wettest month.
Where to stay near Union County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.