• county
  • FIPS 42085
  • Largest town: Hermitage

Mercer County, Pennsylvania

Mercer County had 108,140 residents in the Census Vintage 2024 estimate, on 672.5 square miles of land. It ranks 30th of 67 in Pennsylvania by population and 33rd by land area.

Population
108,140
#30 of 67 in Pennsylvania · #585 in US
Area
672.5 sq mi
#33 of 67 in Pennsylvania · #1,402 in US
Density
161 / sq mi
#31 of 67 in Pennsylvania · #663 in US
Median household income
$61,530
#39 of 67 in Pennsylvania · #1,685 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Mercer County within Pennsylvania. Pin: Harrisburg.

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Tools and pages that start from Mercer County

Mercer County population, land area and income

Mercer County had 108,140 residents in the Census Vintage 2024 estimate, on 672.5 square miles of land. It ranks 30th of 67 in Pennsylvania by population and 33rd by land area. That works out to 160.8 people per square mile, 1.7 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Pennsylvania has 82,953 residents; Mercer County is somewhat larger.

Its SAIPE 2023 median household income of $61,530 is below the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

108,140

3144th1st

585th of 3,144 (US)

Land area

673 sq mi

3144th1st

1402nd of 3,144 (US)

Density

160.8 / sq mi

3144th1st

663rd of 3,144 (US)

Median household income

$61,530

3143rd1st

1685th of 3,143 (US)

Rank within Pennsylvania (67)

Population

108,140

67th1st

30th of 67 (PA)

Land area

673 sq mi

67th1st

33rd of 67 (PA)

Density

160.8 / sq mi

67th1st

31st of 67 (PA)

Median household income

$61,530

67th1st

39th of 67 (PA)

How Mercer County's population changed since 2020

Mercer County lost 2,408 residents between the July 2020 and July 2024 estimates, a drop of 2.2%. That ranks 54th of 67 in Pennsylvania for growth. The median Pennsylvania county changed by -0.5%, and the state as a whole by +0.6%.

Since the April 2020 estimates base, Mercer County recorded 4,186 births and 7,014 deaths, a natural change of -2,828. Net international migration added +86 and net domestic migration, people moving to or from other US counties, came to +232. The largest single component was natural change, which removed 2,828 people.

110.5k2020110.0k2021109.1k2022108.5k2023108.1k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
4,186
Deaths
7,014
Net international migration
+86
Net domestic migration
+232
Change, July 2023 to July 2024
-379

Where Mercer County is

The Census internal point of Mercer County is at 41.300000, -80.252800. It sits in UTM zone 17N. The map shades Pennsylvania's 67 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Mercer County outlined. Dots are towns of 1,000+ people with residents in it.

Adams County: +4.0%Potter County: -2.4%Sullivan County: +1.6%Bucks County: +0.6%Carbon County: +1.5%McKean County: -2.3%Montour County: -0.1%Fulton County: -0.9%Columbia County: +2.0%Cameron County: -4.1%Elk County: -2.6%Bradford County: -0.4%Bedford County: +0.1%York County: +3.2%Monroe County: -1.1%Forest County: -5.2%Berks County: +2.4%Cambria County: -2.3%Franklin County: +2.1%Snyder County: -0.3%Somerset County: -2.5%Clarion County: -0.9%Indiana County: -0.2%Lackawanna County: +0.6%Wyoming County: -1.0%Lawrence County: -2.0%Mercer County: -2.2%Lehigh County: +3.0%Northampton County: +3.3%Cumberland County: +5.9%Fayette County: -3.6%Jefferson County: -2.5%Centre County: +1.2%Lebanon County: +1.4%Union County: -1.2%Clinton County: +1.3%Chester County: +4.8%Montgomery County: +2.6%Wayne County: +0.5%Pike County: +6.5%Susquehanna County: -0.6%Allegheny County: -1.4%Clearfield County: -2.9%Butler County: +2.7%Beaver County: -1.4%Crawford County: -2.1%Washington County: +0.5%Venango County: -1.7%Warren County: -3.0%Blair County: -2.0%Huntingdon County: -1.6%Lancaster County: +1.9%Luzerne County: +1.9%Westmoreland County: -1.0%Juniata County: -0.4%Armstrong County: -2.7%Tioga County: -0.8%Delaware County: +1.4%Northumberland County: -1.7%Mifflin County: -0.5%Lycoming County: -0.8%Perry County: +2.1%Philadelphia County: -1.7%Schuylkill County: +1.1%Dauphin County: +2.2%Greene County: -5.3%Erie County: -1.1%
Change 2020 to 2024
  1. < -2.2%
  2. < -1.0%
  3. < +0.1%
  4. < +1.9%
  5. ≥ +1.9%
no data

Orange pin: Mercer County internal point. Dark pin: Harrisburg.

Internal point

Decimal
41.300000, -80.252800
DMS
41°18'0.00"N 80°15'10.08"W
UTM
17N 562555.1E 4572330.0N
Geohash
dpqfvy3ty
Plus code
86HX8P2W+2V

Towns in Mercer County

7 incorporated places of 1,000+ people have residents in Mercer County, 51,982 people together, or 48% of the county. Each figure counts only the part of the town inside Mercer County; towns marked "part" extend into another county. The largest is Hermitage with 15,839.

  1. 01Hermitage15,839
  2. 02Sharon12,744
  3. 03Grove City7,749
  4. 04Greenville5,459
  5. 05Farrell4,142
  6. 06Sharpsville4,127
  7. 07Mercer1,922
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Mercer County

The Census 2024 county adjacency file lists 6 neighbors for Mercer County, including 2 across a state line. The most populous is Mahoning County, OH, with 225,786 residents. Distances run between Census internal points in a straight line.

Distance to Harrisburg and the nearest big city

Harrisburg is 190.2 miles ESE of Mercer County's internal point in a straight line. The nearest place of 100,000 or more is Pittsburgh, PA (population 307,668), 61.1 miles away. The nearest place of 10,000 or more is Hermitage, PA (population 15,839), 10.9 miles away.

Mercer County FIPS code

The FIPS code of Mercer County is 42085: state code 42 for Pennsylvania plus county code 085. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $61,530.

Questions people ask

What is the population of Mercer County, Pennsylvania?

The Census Vintage 2024 estimate for July 1, 2024 is 108,140. That is down 2,408 people (2.2%) from the July 2020 estimate of 110,548.

What is the FIPS code of Mercer County?

42085. The first two digits (42) are Pennsylvania; the last three (085) identify the county.

What is the largest town in Mercer County?

Hermitage, with 15,839 residents inside Mercer County in 2024.

Which counties border Mercer County?

6 county-equivalents border it in the Census 2024 adjacency file: Mahoning County, OH; Trumbull County, OH; Butler County, PA; Lawrence County, PA; Crawford County, PA; Venango County, PA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.