Union County, Pennsylvania Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 50th-largest in Pennsylvania
The population of Union County, Pennsylvania is 42,570 as of the 2023 American Community Survey, making it the 50th-largest county in Pennsylvania. The median household income is $72,894, the median home value is $222,900, and the median age is 40.5.
The population of Union County has declined 6.3% since 2010 (45,005 → 42,159), a -0.47% annualized rate.
42,570
Population
-0.47%
Annual growth
135
People / sq mi
$72,894
Median Income
$222,900
Median Home Value
Union County covers 316 sq mi of land at 134.7 people per square mile.
About Union County, PA
Union County is a county in Pennsylvania with a population of 42,570. It ranks #50 among counties in Pennsylvania by population. The median age is 40.5, older than the national median. The population is 53.9% male and 46.1% female.
The median household income in Union County is $72,894, near the US median of $74,580. 5.2% of residents live below the federal poverty level. Home values sit at a median of $222,900, with monthly rent averaging $944. The homeownership rate of 71.4% is higher than the national rate of 64.8%.
Educational attainment in Union County reflects 26.4% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 7.5% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 18.0 minutes each way.
Union County Population History (2010-2024)
The county of Union County had a population of 45,005 in 2010 and 42,159 in 2024, a -6.3% growth over 14 years. The peak was 45,573 in 2015. Average annual growth rate: -0.46%.
42,159
Population (2024)
45,005
Population (2010)
45,573
Peak (2015)
-0.46%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 45,005 |
| 2011 | 45,130 |
| 2012 | 45,195 |
| 2013 | 44,773 |
| 2014 | 45,017 |
| 2015 | 45,573 |
| 2016 | 45,527 |
| 2017 | 44,744 |
| 2018 | 45,090 |
| 2019 | 44,498 |
| 2020 | 42,655 |
| 2021 | 42,484 |
| 2022 | 42,745 |
| 2023 | 42,237 |
| 2024 | 42,159 |
Race & Ethnicity
| White | 89.1% |
| Black or African American | 6.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.5% |
| Two or More Races | 0.0% |
Age & Sex
40.5
Median Age
46.1%
Female
53.9%
Male
19.5%
Age 65+
Age Distribution
Children (under 15): 14.1% · Seniors (65+): 19.5%
Income & Poverty
| Median household income | $72,894$-3,187 vs state |
| Mean household income | $103,373 |
| Per-capita income | $36,765 |
| Poverty rate | 5.2%-2.9% vs state |
| Unemployment rate | 1.1% |
| Employment-to-population | 48.1% |
Top Industries by Employment
The largest employment sector in Union County is professional & business services, accounting for 38.8% of workers.
How residents commute
0.3%
Drive alone
9.7%
Carpool
72.0%
Public transit
7.5%
Work from home
18.0 min
Avg commute
Housing
$222,900$-17,600 vs state
Median home value
$944
Median rent
71.4%
Homeownership rate
16,158
Total housing units
88.5%
Occupied
11.5%
Vacant
28.6%
Renter-occupied
Social & access
90.1%
With health insurance
86.3%
With broadband internet
25.4%
Foreign-born
6.4%
Veterans (18+)
13.2%
With a disability
89.7%
Speak language other than English at home
Education
86.7%
High School+
26.4%
Bachelor's+
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Part of Pennsylvania
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County rankings
Frequently Asked Questions
Union County, Pennsylvania has a population of 42,570 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 50th-largest county in Pennsylvania. Population density is 135 people per square mile.
The population of Union County has declined 6.3% since 2010 (45,005 → 42,159), a -0.47% annualized rate.
The median household income in Union County, Pennsylvania is $72,894, with mean (average) household income of $103,373 and per-capita income of $36,765. 5.2% of residents live below the federal poverty level.
In Union County, the largest racial and ethnic groups are White (89.1%), Black or African American (6.0%), Hispanic or Latino (0.5%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Union County, Pennsylvania is 40.5 years. Residents are 46.1% female and 53.9% male.
The median home value in Union County is $222,900 and median monthly rent is $944. 71.4% of occupied housing units are owner-occupied. The county has 16,158 total housing units, 11.5% of which are vacant.
The largest employment sector in Union County, Pennsylvania is professional, scientific, and management services, employing 38.8% of workers. The unemployment rate is 1.1%.
Philadelphia is among the largest cities associated with Union County, Pennsylvania, with a population of 1,582,432.
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Statewide data for Pennsylvania
Population, race, income, age, and trends across Pennsylvania
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.