Pennsylvania

Washington

209,349
2020 population
1790
first census record
24
census records

About Washington

Washington, Pennsylvania, first appears in the United States federal census in 1790, when it recorded a population of 23,866. At the most recent census, in 2020, its population stood at 209,349.

Its recorded population peaked at 217,271 in 1960, and has since declined by roughly 4 percent.

On the ground today, 9 documented military engagements have been recorded within the county, among them Braddock's Defeat – Battle of Monongahela July 9 1755, Whiskey Rebellion — Battle of Bower Hill, Whiskey Rebellion — Battle of Bower Hill (July 17, 1794), and 100 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020209,349
2010207,820
2000202,897
1990204,584
1980217,074
1970210,876
1960217,271
1950209,628
1940210,852
1930204,802
1920188,992
1910143,680
190092,181
189071,155
188055,418
187048,483
186046,805
185044,939
184041,279
183042,784
182040,038
181036,289
180028,298
179023,866
Source

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

Battles & engagements in Washington

Military engagements that took place in Washington, Pennsylvania.

Braddock's Defeat – Battle of Monongahela July 9 1755
1755
Whiskey Rebellion — Battle of Bower Hill
1794
Whiskey Rebellion — Battle of Bower Hill (July 17, 1794)
1794
Burning of Neville's House (Bower Hill — Second Attack)
1794
Whiskey Rebellion — Bower Hill Siege 1794
1794
Attack on Bower Hill (Whiskey Rebellion)
1794
Whiskey Rebellion — Battle of Bower Hill PA (1794)
1794
Parkinson's Ferry Muster (Whiskey Rebellion)
1794
Whiskey Rebellion - Battle of Bower Hill
1794

Historic places in Washington

National Register of Historic Places listings in Washington, Pennsylvania.

Administration Building, Washington and Jefferson College
Canonsburg
Pennsylvania Railroad Passenger Station
California
Charleroi-Monessen Bridge
Charleroi
Wright, Enoch, House
Peters Township
Acheson, Edward G., House
Monongahela
Huffman Distillery and Chopping Mill
Cokeburg
Washington Armory
Washington
Roberts House
Canonsburg
Lyle Covered Bridge
Raccoon
Centerville Historic District
Centerville
Hill's Tavern
Scenery Hill
LeMoyne, F. Julius, House
Washington
"S" Bridge
Washington
Dusmal House
Gastonville
Devil's Den, McClurg Covered Bridge
Paris
Bradford, David, House
Washington
Munce, Thomas, House
Washington
Thome, James, Farm
Eighty Four
Jennings-Gallagher House
California
Wilson, Levi, Tavern
Buffalo Twp.
Meadowcroft Rockshelter
Avella
Parkinson, Robert, Farm
Morris Township
Webster Donora Bridge
Donora
US Post Office-Charleroi
Charleroi
Browse all Pennsylvaniahistoric sites ›

Other counties in Pennsylvania

Explore census history and historic records for more Pennsylvania counties.

MonroeMontgomeryMontourNorthamptonNorthumberlandPerryPhiladelphiaPikePotterSchuylkillSnyderSomersetSullivanSusquehannaTiogaUnionVenangoWarrenWayneWestmoreland
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Everything a full report reveals about Washington County, Pennsylvania

This page charts the census history of Washington 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.
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Pennsylvaniahistory ›NRHP historic sites ›Notable people from Pennsylvania›

Frequently asked about Washington

When does Washington first appear in the US census?
Washington, Pennsylvania first appears in the federal census in 1790, with a recorded population of 23,866.
What is the population of Washington?
At the most recent federal census (2020), Washington had a recorded population of 209,349.
When did Washington's population peak?
Washington's recorded population peaked at 217,271 in 1960.
Were any battles fought in Washington?
9 documented military engagements took place in Washington, including Braddock's Defeat – Battle of Monongahela July 9 1755, Whiskey Rebellion — Battle of Bower Hill, Whiskey Rebellion — Battle of Bower Hill (July 17, 1794).
How many historic places are in Washington?
100 sites are listed on the National Register of Historic Places in Washington, Pennsylvania.
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