Pennsylvania
Allegheny
1,250,578
2020 population
1790
first census record
24
census records
About Allegheny
Allegheny, Pennsylvania, first appears in the United States federal census in 1790, when it recorded a population of 10,309. At the most recent census, in 2020, its population stood at 1,250,578.
Its recorded population peaked at 1,628,587 in 1960, and has since declined by roughly 23 percent.
On the ground today, 40 documented military engagements have been recorded within the county, among them Monongahela Culture Fortified Village – Johnston Site, Capture of Fort Trent (Forks of Ohio), Braddock's Defeat — Indian Scouts Action, and 270 places are listed on the National Register of Historic Places.
Population by decade
Source
Population data from the United States decennial census, U.S. Census Bureau (public domain).
Battles & engagements in Allegheny
Military engagements that took place in Allegheny, Pennsylvania.
Monongahela Culture Fortified Village – Johnston Site
1400
Capture of Fort Trent (Forks of Ohio)
1754
Braddock's Defeat — Indian Scouts Action
1755
Braddock's Defeat (Battle of the Monongahela) 1755
1755
Braddock's Defeat — Battle of Monongahela
1755
Braddock's Defeat
1755
Battle of the Monongahela - Grant's Defeat 1758
1755
Braddock's Defeat (Battle of Monongahela) 1755
1755
Pennsylvania Regiment action at Monongahela
1755
Braddock's Defeat Monongahela
1755
Braddock's Defeat 1755
1755
Battle of the Monongahela
1755
Battle of the Monongahela (Braddock's Defeat)
1755
Forbes Expedition — Battle of Fort Duquesne
1758
Forbes Campaign / Battle of Fort Duquesne
1758
Battle of Fort Duquesne (Grant's Defeat)
1758
Battle of Fort Duquesne (Grant's Defeat) 1758
1758
Grant's Defeat near Fort Duquesne
1758
Forbes Expedition to Fort Duquesne
1758
Battle of Fort Duquesne Approach 1755
1758
Capture of Fort Duquesne (Forbes Expedition) 1758
1758
Forbes Expedition / Capture of Fort Duquesne
1758
French and Indian War – Grant's Defeat at Fort Duquesne 1758
1758
Siege of Fort Duquesne (1758)
1758
Siege of Fort Pitt (construction/defense, 1759)
1759
Siege of Fort Pitt (Pontiac's Rebellion)
1763
Battle of Fort Pitt (Pontiac's War) 1763
1763
Pontiac's War – Siege of Fort Pitt 1763
1763
Siege of Fort Pitt (Pontiac's War)
1763
Pontiac's War — Siege of Fort Pitt
1763
Pontiac's War – Fort Pitt Siege 1763
1763
Pontiac's War — Smallpox Blankets Fort Pitt
1763
Battle of Point Pleasant approach - Fort Pitt context
1777
Muster at Braddock's Field (Whiskey Rebellion)
1794
Neville Home Attack (Whiskey Rebellion)
1794
Liberty Pole Incidents (Whiskey Rebellion)
1794
Whiskey Rebellion — Parkinson's Ferry Meeting
1794
Whiskey Rebellion – Braddock's Field Muster
1794
Whiskey Rebellion — Braddock's Fields Muster (August 1, 1794)
1794
Braddock's Field Muster (Whiskey Rebellion)
1794
Historic places in Allegheny
National Register of Historic Places listings in Allegheny, Pennsylvania.
Highland Towers Apartments
Pittsburgh
Bell Telephone Company of Pennsylvania Western Headquarters Building
Pittsburgh
West End-North Side Bridge
Pittsburgh
Colfax Elementary School
Pittsburgh
East Liberty Commercial Historic District
Pittsburgh
Hunt Armory
Pittsburgh
109-115 Wood Street
Pittsburgh
Allerdice, Taylor, High School
Pittsburgh
Pittsburgh Terminal Warehouse and Transfer Company
Pittsburgh
Oakdale Public School
Oakdale
Deutschtown Historic District
Pittsburgh
Hamnett Historic District
Wilkinsburg
Kennywood Park
West Mifflin
Homestead Pennsylvania Railroad Station
Homestead
Seventh Street Bridge
Pittsburgh
Allegheny Post Office
Pittsburgh
Morrow, John, Elementary School
Pittsburgh
Oliver, David P., High School
Pittsburgh
Lawrence Public School
Pittsburgh
United States Post Office-Sewickley Branch
Sewickley
Lincoln Elementary School
Pittsburgh
Birmingham Public School
Pittsburgh
Schenley Farms Historic District (Additional Documentation)
Pittsburgh
Pittsburgh Mercantile Company Building
Pittsburgh
Unlimited access
Everything a full report reveals about Allegheny County, Pennsylvania
This page charts the census history of Allegheny 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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Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
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Frequently asked about Allegheny
When does Allegheny first appear in the US census?
Allegheny, Pennsylvania first appears in the federal census in 1790, with a recorded population of 10,309.
What is the population of Allegheny?
At the most recent federal census (2020), Allegheny had a recorded population of 1,250,578.
When did Allegheny's population peak?
Allegheny's recorded population peaked at 1,628,587 in 1960.
Were any battles fought in Allegheny?
40 documented military engagements took place in Allegheny, including Monongahela Culture Fortified Village – Johnston Site, Capture of Fort Trent (Forks of Ohio), Braddock's Defeat — Indian Scouts Action.
How many historic places are in Allegheny?
270 sites are listed on the National Register of Historic Places in Allegheny, Pennsylvania.
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