Pennsylvania

Mercer

110,652
2020 population
1800
first census record
23
census records

About Mercer

Mercer, Pennsylvania, first appears in the United States federal census in 1800, when it recorded a population of 3,228. At the most recent census, in 2020, its population stood at 110,652.

Its recorded population peaked at 128,299 in 1980, and has since declined by roughly 14 percent.

On the ground today, 15 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020110,652
2010116,638
2000120,293
1990121,003
1980128,299
1970127,175
1960127,519
1950111,954
1940101,039
193099,246
192093,788
191077,699
190057,387
189055,744
188056,161
187049,977
186036,856
185033,172
184032,873
183019,729
182011,681
18108,277
18003,228
Source

Population data from the United States decennial census, U.S. Census Bureau (public domain).

Historic places in Mercer

National Register of Historic Places listings in Mercer, Pennsylvania.

August, Wendell, Forge
Grove City
Big Bend Historical Area
Mercer
Bridge in French Creek Township
Carlton
Waugh, Alexander P. and James S., House
Greenville
Lindsey, Christiana, House
Mercer Borough
Mercer County Court House
Mercer
First Universalish Church of Sharpsville
Sharpsville
New Hamburg Historical Area
Greenville
Buhl, Frank H., Mansion
Sharon
Gibson House
Jamestown
Kidd's Mills Covered Bridge Historic District
Greenville
Greenville Commercial Historic District
Greenville
Browse all Pennsylvaniahistoric sites ›

Other counties in Pennsylvania

Explore census history and historic records for more Pennsylvania counties.

JeffersonJuniataLackawannaLancasterLawrenceLebanonLehighLuzerneLycomingMcKeanMifflinMonroeMontgomeryMontourNorthamptonNorthumberlandPerryPhiladelphiaPikePotter
Unlimited access

Everything a full report reveals about Mercer County, Pennsylvania

This page charts the census history of Mercer County, Pennsylvania. A full Aubrey report for an address here pulls together everything the historical record holds about the ground, from the earliest settlement to the twentieth century:

Overview
An interactive map of the location with historic sites, battles and Native heritage plotted, and its full story era by era.
The Land
The historic sites and place names around the location, and how this land was settled and used.
Geology
The bedrock beneath the site, its age and rock type, reaching back millions of years.
LiDAR Terrain
Laser-scanned terrain that reveals earthworks and old features hidden in the landscape.
Conflict & War
The battles, raids and skirmishes fought near here, across every era of American conflict.
The Civil War
The Civil War on this ground, 1861 to 1865: who held it, and the battles, camps and regiments nearby.
The Soldiers
The men who marched from here in the Civil War, named and traced where the record allows.
Native Heritage
The Native nations who held this land, mapped across time from before European contact to today.
Settlement
Who claimed and held this ground, from Indigenous homelands through the colonial powers to the United States.
The Community
How the town grew, who came, and what kind of place it became, traced through the census record.
Rivers & Rail
The rivers, canals and railroads that connected this place between 1830 and 1911.
Notable People
The people born, buried or genuinely tied to this exact place, with their stories.
Historical Maps
Historic maps of the location layered over how it looks today.
Finds & Access
Museum objects tied to the area, and the laws on searching, collecting and access here.
Literature
The old books, county histories and archives that mention this place, quoted with their sources.
Spotlight
A deep dive into the most remarkable, lesser-known history of the place, traced back to the record.
Points of Interest
The most significant historic sites and landmarks near the location, and why they matter.
Timeline
The whole story of the location told era by era, from first peoples to the present day.
First month just $5.99, then $11.99 a month. Unlimited locations, cancel anytime.

Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.

Start your Mercer County, Pennsylvania report
Or see a real report first

Explore Pennsylvania records

Pennsylvaniahistory ›NRHP historic sites ›Notable people from Pennsylvania›

Frequently asked about Mercer

When does Mercer first appear in the US census?
Mercer, Pennsylvania first appears in the federal census in 1800, with a recorded population of 3,228.
What is the population of Mercer?
At the most recent federal census (2020), Mercer had a recorded population of 110,652.
When did Mercer's population peak?
Mercer's recorded population peaked at 128,299 in 1980.
How many historic places are in Mercer?
15 sites are listed on the National Register of Historic Places in Mercer, Pennsylvania.
Aubrey Research

Research the history of any US location

Aubrey searches federal archives, archaeological records, historic registers, and primary sources to build a full historical report for any address or place in the United States.

Research your locationView a free sample report