Mercer County, Pennsylvania Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 30th-largest in Pennsylvania
The population of Mercer County, Pennsylvania is 109,852 as of the 2023 American Community Survey, making it the 30th-largest county in Pennsylvania. The median household income is $60,614, the median home value is $153,600, and the median age is 45.2.
The population of Mercer County has declined 7.3% since 2010 (116,607 → 108,140), a -0.54% annualized rate.
109,852
Population
-0.54%
Annual growth
163
People / sq mi
$60,614
Median Income
$153,600
Median Home Value
Mercer County covers 673 sq mi of land at 163.3 people per square mile.
About Mercer County, PA
Age is the most distinctive thing about Mercer County: a median age of 45.2, older than the national median. With 109,852 residents, Mercer County is a county in Pennsylvania. It ranks #30 among counties in Pennsylvania by population.
Household earnings are middling, with a median of $60,614 — below the US median of $78,538. Poverty runs at 9.5%, below the national 12.4%. Homes carry a median value of $153,600, with typical rent around $808.
Roughly 25.1% of adults have a bachelor’s, below the national 35.0%. Remote work is below the national 14.0% at 7.8%, and the average commute runs about 22 minutes each way.
The age structure shapes everything downstream in Mercer County — from housing demand to the mix of working-age earners reflected in the income figures above.
Mercer County Population History (2010-2024)
The county of Mercer County had a population of 116,607 in 2010 and 108,140 in 2024, a -7.3% growth over 14 years. The peak was 116,607 in 2010. Average annual growth rate: -0.54%.
108,140
Population (2024)
116,607
Population (2010)
116,607
Peak (2010)
-0.54%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 116,607 |
| 2011 | 116,169 |
| 2012 | 115,660 |
| 2013 | 115,162 |
| 2014 | 114,724 |
| 2015 | 113,684 |
| 2016 | 112,651 |
| 2017 | 111,526 |
| 2018 | 110,575 |
| 2019 | 109,296 |
| 2020 | 110,548 |
| 2021 | 109,964 |
| 2022 | 109,115 |
| 2023 | 108,519 |
| 2024 | 108,140 |
Race & Ethnicity
| White | 89.0% |
| Black or African American | 5.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.0% |
Age & Sex
45.2
Median Age
50.4%
Female
49.6%
Male
22.8%
Age 65+
Age Distribution
Children (under 15): 15.3% · Seniors (65+): 22.8%
Income & Poverty
| Median household income | $60,614$-15,467 vs state |
| Mean household income | $78,316 |
| Per-capita income | $33,320 |
| Poverty rate | 9.5%+1.4% vs state |
| Unemployment rate | 2.9% |
| Employment-to-population | 52.2% |
Top Industries by Employment
The largest employment sector in Mercer County is professional & business services, accounting for 28.4% of workers.
How residents commute
0.2%
Drive alone
2.8%
Carpool
80.8%
Public transit
7.8%
Work from home
22.0 min
Avg commute
Housing
$153,600$-86,900 vs state
Median home value
$808
Median rent
72.5%
Homeownership rate
50,884
Total housing units
90.6%
Occupied
9.4%
Vacant
27.5%
Renter-occupied
Social & access
94.0%
With health insurance
89.6%
With broadband internet
17.8%
Foreign-born
8.7%
Veterans (18+)
17.3%
With a disability
96.2%
Speak language other than English at home
Education
91.3%
High School+
25.1%
Bachelor's+
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County rankings
Frequently Asked Questions
Mercer County, Pennsylvania has a population of 109,852 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 30th-largest county in Pennsylvania. Population density is 163 people per square mile.
The population of Mercer County has declined 7.3% since 2010 (116,607 → 108,140), a -0.54% annualized rate.
The median household income in Mercer County, Pennsylvania is $60,614, with mean (average) household income of $78,316 and per-capita income of $33,320. 9.5% of residents live below the federal poverty level.
In Mercer County, the largest racial and ethnic groups are White (89.0%), Black or African American (5.6%), Hispanic or Latino (0.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Mercer County, Pennsylvania is 45.2 years. Residents are 50.4% female and 49.6% male.
The median home value in Mercer County is $153,600 and median monthly rent is $808. 72.5% of occupied housing units are owner-occupied. The county has 50,884 total housing units, 9.4% of which are vacant.
The largest employment sector in Mercer County, Pennsylvania is professional, scientific, and management services, employing 28.4% of workers. The unemployment rate is 2.9%.
Philadelphia is among the largest cities associated with Mercer County, Pennsylvania, with a population of 1,582,432.
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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.