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
Mercer County is a county in Pennsylvania with a population of 109,852. It ranks #30 among counties in Pennsylvania by population. The median age is 45.2, older than the national median. The population is 49.6% male and 50.4% female.
The median household income in Mercer County is $60,614, below the US median of $74,580. 9.5% of residents live below the federal poverty level. Home values sit at a median of $153,600, with monthly rent averaging $808. The homeownership rate of 72.5% is higher than the national rate of 64.8%.
Educational attainment in Mercer County reflects 25.1% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 7.8% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 22.0 minutes each way.
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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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.