Pennsylvania

Westmoreland

354,663
2020 population
1790
first census record
24
census records

About Westmoreland

Westmoreland, Pennsylvania, first appears in the United States federal census in 1790, when it recorded a population of 16,018. At the most recent census, in 2020, its population stood at 354,663.

Its recorded population peaked at 392,294 in 1980, and has since declined by roughly 10 percent.

On the ground today, 26 documented military engagements have been recorded within the county, among them Monongahela Culture Village Raids, Braddock's Road skirmishes (advance to Monongahela), Braddock's Road Advance Skirmish, and 52 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020354,663
2010365,169
2000369,993
1990370,321
1980392,294
1970376,935
1960352,629
1950313,179
1940303,411
1930294,995
1920273,568
1910231,304
1900160,175
1890112,819
188078,036
187058,719
186053,736
185051,726
184042,699
183038,400
182030,540
181026,392
180022,726
179016,018
Source

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

Battles & engagements in Westmoreland

Military engagements that took place in Westmoreland, Pennsylvania.

Monongahela Culture Village Raids
1050
Braddock's Road skirmishes (advance to Monongahela)
1755
Braddock's Road Advance Skirmish
1755
Skirmish at Bushy Run (Forbes road, 1758)
1758
Forbes Road skirmishes Pennsylvania
1758
French and Indian War – Battle of Fort Ligonier 1758
1758
Battle of Fort Ligonier
1758
Battle of Loyalhanna
1758
Siege of Fort Ligonier (1758)
1758
Forbes Road skirmishes PA 1758
1758
Siege of Fort Ligonier
1758
Battle of Bushy Run (Pontiac's War 1763)
1763
Pontiac's War – Battle of Bushy Run August 5-6 1763
1763
Battle of Bushy Run 1763
1763
Battle of Bushy Run (Pontiac's War)
1763
Battle of Bushy Run
1763
Siege of Fort Ligonier (1763)
1763
Pontiac's War – Battle of Bushy Run Second Day 1763
1763
Pontiac's War - Battle of Bushy Run 1763
1763
Pontiac's War – Battle of Bushy Run First Day 1763
1763
Fort Ligonier Attack
1763
Battle of Bushy Run (post-war follow-up, 1778)
1778
Massacre at Hanna's Town (Pennsylvania)
1782
Battle of Hanna's Town (PA frontier)
1782
Massacre at Hannastown
1782
Burning of Hannastown
1782

Historic places in Westmoreland

National Register of Historic Places listings in Westmoreland, Pennsylvania.

Academy Hill Historic District
Greensburg
Ligonier Armory
Ligonier
Fort Ligonier Site
Ligonier
Mount St. Peter Roman Catholic Church
New Kensington
St. Vincent Archabbey Gristmill
Latrobe
Fairview Park
Salem Township
Scottdale Armory
Scottdale
Hannastown Farm
Forbes Road
Mount Pleasant Historic District
Mount Pleasant
Ligonier Historic District
Ligonier
Walter, John, Farmstead
Export
Vandergrift Historic District
Vandergrift
Scottdale Historic District
Scottdale
Fisher, Adam, Homestead
United
Dick Building
West Newton
Bushy Run Battlefield
Harrison City
Old Hannastown, Site of
Greensburg
Greensburg Railroad Station
Greensburg
New Kensington Production Works Historic District
New Kensington
Laurel Hill Furnace
New Florence
New Kensington Downtown Historic District
New Kensington
Salem Crossroads Historic District
Delmont
Slickville Historic District
Slickville
Pennsylvania Railroad Station-Latrobe
Latrobe
Browse all Pennsylvaniahistoric sites ›

Other counties in Pennsylvania

Explore census history and historic records for more Pennsylvania counties.

BradfordBucksButlerCambriaCameronCarbonCentreChesterClarionClearfieldClintonColumbiaCrawfordCumberlandDauphinDelawareElkErieFayetteForest
Unlimited access

Everything a full report reveals about Westmoreland County, Pennsylvania

This page charts the census history of Westmoreland 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 Westmoreland County, Pennsylvania report
Or see a real report first

Explore Pennsylvania records

Pennsylvaniahistory ›NRHP historic sites ›Notable people from Pennsylvania›

Frequently asked about Westmoreland

When does Westmoreland first appear in the US census?
Westmoreland, Pennsylvania first appears in the federal census in 1790, with a recorded population of 16,018.
What is the population of Westmoreland?
At the most recent federal census (2020), Westmoreland had a recorded population of 354,663.
When did Westmoreland's population peak?
Westmoreland's recorded population peaked at 392,294 in 1980.
Were any battles fought in Westmoreland?
26 documented military engagements took place in Westmoreland, including Monongahela Culture Village Raids, Braddock's Road skirmishes (advance to Monongahela), Braddock's Road Advance Skirmish.
How many historic places are in Westmoreland?
52 sites are listed on the National Register of Historic Places in Westmoreland, 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