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
The poverty rate is what most separates Union County from the typical county: 5.2% of residents live below the federal poverty line, against 12.4% nationally. With 42,570 residents, Union County is a county in Pennsylvania. It ranks #50 among counties in Pennsylvania by population.
Households take in a median $72,894, comfortably below the US median of $78,538. Poverty is relatively low for US counties at 5.2%, below the national 12.4%. Median home value is $222,900, with typical rent around $944.
Degree attainment is mid-range for US counties: 26.4% of adults hold a four-year degree, below the national 35.0%. Around 7.5% of workers work from home, below the national 14.0%, and the average commute runs about 18 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+
Largest cities in Pennsylvania
Other counties in Pennsylvania
Part of Pennsylvania
Metro areas in Pennsylvania
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.