Allegheny County , Pennsylvania

Allegheny County: County in the southwestern part of the U.S. state of Pennsylvania

Allegheny County locator map
Location of Allegheny County on Pennsylvania map.


Allegheny County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 1,223,348 and a population density of 634 people per km². After 9 years in 2019 county had an estimated population of 1,216,045 inhabitants. Its county seat is Pittsburgh. The county was created 232 years ago in 1788.


Allegheny County is located at 40°28'8"N 79°58'52"W (40.4688300, -79.9811900). It has 4 neighbors: Armstrong County, Butler County, Washington County and Westmoreland County.

AlleghenyCountyCourthouse image

The largest city of Allegheny County is Pittsburgh with a population of 300,286. Other cities include, Penn Hills population 40,807, Municipality of Bethel Park population 32,345, Bethel Park population 32,118 and Mount Lebanon population 31,927. See all Allegheny County cities & populated places.

AlleghenyCountyCourthouse image

Allegheny County map

Allegheny County Quick Facts

Population : 1,216,045 (2019)
Country : United States of America
State : Pennsylvania (United States)
Different from : Anderson County, Allen County, Anderson County, Allen County, Alleghany County, Anderson County, Allegany County, Anderson County, Allen Parish, Allegan County, Alleghany County, Allen County, Allen County, Allegany County, Anderson County
Area : 1929 km2
Official name : Allegheny County
Water as percent of area : 1.9%
Land as percent of area : 98.1%
Named for : Allegheny River
Altitude : 961 feet / 293 meters
Capital : Pittsburgh
Establishment : September 09, 1788
Time Zone : America/New_York
Local time : 04:49:50 (4th August 2021)
Density : 630 Pop. per km² as of 2019
Population growth : -0.6% (2010-2019)

Allegheny County has 4 neighbours.


According to census records, the population of Allegheny County decreased by 0.6% in 9 years.

Year Population % Change Method
2010 1,223,348 - census
2011 1,228,297 0.4% estimation process
2012 1,230,911 0.21% estimation process
2013 1,233,700 0.23% estimation process
2014 1,233,027 -0.05% estimation process
2015 1,228,827 -0.34% estimation process
2016 1,226,426 -0.2% estimation process
2017 1,220,141 -0.52% estimation process
2018 1,217,281 -0.23% estimation process
2019 1,216,045 -0.1% estimation process

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People born in Allegheny County (38)

People born in Allegheny County, including horticulturist Alex Shigo, historian, toponymist, and novelist George R. Stewart, actor/film director Lois Weber, you can see a list of people who born in Allegheny County.

Allegheny County Populated Places (more)

Cities, Towns, Neighborhoods & Other Populated Places in Allegheny County.

City Name Population Title
Pittsburgh 300,286 County seat in Allegheny County, Pennsylvania, United States
Penn Hills 40,807 Home rule municipality of Pennsylvania
Bethel Park 32,118 Home rule municipality of Pennsylvania
Mount Lebanon 31,927 Municipality in Pennsylvania
Monroeville 28,176 City in Alabama, United States
Moon 25,437 Township in Allegheny County, Pennsylvania
Unity 21,815 Township in Westmoreland County, Pennsylvania, United States
Allison Park 21,552
Baldwin 19,819
Upper Saint Clair 19,744 Home rule municipality in Allegheny County
West Mifflin 19,699 Borough of Pennsylvania
McKeesport 19,009 City in Allegheny County, Pennsylvania, United States
Manchester 18,648 Borough in Pennsylvania
Wilkinsburg 15,292 Borough of Pennsylvania
Franklin Park 14,885 Borough of Pennsylvania
Whitehall 13,834

Pennsylvania Other Counties (more counties)

County Name Population Title
Pennsylvania 12,801,989 State in the northeastern United States
Philadelphia County 1,584,064 County in Pennsylvania, United States
Philadelphia 1,584,064 Largest city in Pennsylvania, United States
Montgomery County 830,915 County in Pennsylvania, United States
Bucks County 628,270 County in Pennsylvania, United States
Delaware County 566,747 County in Pennsylvania, United States
Lancaster County 545,724 County in Pennsylvania, United States
Chester County 524,989 County in Pennsylvania, United States
York County 449,058 County in Maine, United States
Berks County 421,164 County in Pennsylvania, United States
Croydon 385,346 London borough in South London
Lehigh County 369,318 County in Pennsylvania, United States of America
Westmoreland County 348,899 County in Pennsylvania, United States
Luzerne County 317,417 County in Pennsylvania, United States
Northampton County 305,285 County in Pennsylvania, United States
Pittsburgh 300,286 County seat in Allegheny County, Pennsylvania, United States

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