Armstrong County, Pennsylvania

Armstrong County: County in Pennsylvania, United States


Armstrong County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 68,941 and a population density of 40 people per km². After 10 years in 2020 county had an estimated population of 64,162 inhabitants. Its county seat is Kittanning. The county was created 224 years ago in 1800.

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

Quick Facts about Armstrong County

Population : 64,162 (2020)
Country : United States of America
State : Pennsylvania (United States)
Different from : Armstrong County
Area : 1721 km2
Official name : Armstrong County
Water as percent of area : 1.6%
Land as percent of area : 98.4%
Named for : John Armstrong
Altitude : 1,056 feet / 322 meters
Capital : Kittanning
Establishment : March 03, 1800
Time Zone : America/New_York
Local time : 14:03:42 (15th June 2024)
Density : 37 Pop. per km² as of 2020
Population growth : -7.45% (2010-2020)
Kittanning Courthouse image
Kittanning Courthouse
Kittanning Courthouse image


Armstrong County is located at 40°48'44"N 79°27'52"W (40.8122900, -79.4645400). It has 6 neighbors: Allegheny County, Butler County, Clarion County, Indiana County, Jefferson County and Westmoreland County.

Armstrong County map

The largest city of Armstrong County is Milton with a population of 6,550. Other cities include, Greenville population 5,177, Kittanning population 3,684, Ford City population 2,735 and Leechburg population 2,069. See all Armstrong County cities & populated places.

Armstrong County Populated Places (more)

Cities, towns, neighborhoods & other populated places in Armstrong County.

City Name Population Title
Milton 6,550 Borough in northwestern Northumberland County, Pennsylvania
Greenville 5,177 Borough in Mercer County, Pennsylvania, United States
Kittanning 3,684 Borough of Pennsylvania
North Buffalo 2,874 Township of Pennsylvania
Ford City 2,735 Borough of Pennsylvania
Leechburg 2,069 Borough of Pennsylvania
Orchard Hills 1,952 Census designated place
Freeport 1,662 Borough of Pennsylvania
Apollo 1,507 Borough of Pennsylvania
North Apollo 1,191 Borough of Pennsylvania
Lenape Heights 1,167 Census designated place
Williamsburg 1,167 Borough of Pennsylvania
South Bend 1,087 Township in Armstrong County, Pennsylvania
West Kittanning 1,078 Borough of Pennsylvania
Adams 910 Community in Armstrong County, Pennsylvania, United States
Rural Valley 806 Borough of Pennsylvania

Armstrong County has 6 neighbours.


According to census records, the population of Armstrong County decreased by 7.45% in 10 years.

Year Population % Change Method
2010 68,941 - census
2011 68,613 -0.48% estimation process
2012 68,176 -0.64% estimation process
2013 67,964 -0.31% estimation process
2014 67,579 -0.57% estimation process
2015 66,860 -1.08% estimation process
2016 66,397 -0.7% estimation process
2017 65,991 -0.62% estimation process
2018 65,352 -0.98% estimation process
2019 64,735 -0.95% estimation process
2020 64,162 -0.89% estimation process

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People born in Armstrong County (8)

People born in Armstrong County, including journalist Nellie Bly, 74th Governor of South Carolina, and an officer in the Union Army Robert Kingston Scott, politician Edgar Wilson, .


  • John Kelso Ormond (American urologist) he was born in 25/03/1886
  • Mary Sibbet Copley (American philanthropist and charity worker) she was born in 19/06/1843
  • Ulysses G. Buzzard (United States Army Medal of Honor recipient) he was born in 31/01/1865
  • W. Stuart Helm (American politician) he was born in 08/04/1908
  • Louis D. Campbell (Mayor of Tacoma) he was born in 01/01/1852

Other places with the same name (2)

Pennsylvania Other Counties (more counties)

County Name Population Title
Philadelphia County 1,578,487 County in Pennsylvania, United States
Philadelphia 1,578,487 The sixth most populous city in the United States and the center of the Philadelphia metropolitan area.
Allegheny County 1,211,358 County in the southwestern part of the U.
Montgomery County 833,869 County in Pennsylvania, United States
Bucks County 627,987 County in Pennsylvania, United States
Delaware County 566,753 County in Pennsylvania, United States
Lancaster County 546,192 County in Pennsylvania, United States
Chester County 526,759 County in Pennsylvania, United States
York County 450,448 County in Maine, United States
Berks County 421,017 County in Pennsylvania, United States
Lehigh County 370,802 County in Pennsylvania, United States of America
Westmoreland County 347,087 County in Pennsylvania, United States
Luzerne County 316,982 County in Pennsylvania, United States
Northampton County 305,892 County in Pennsylvania, United States
Pittsburgh 299,226 The second most populous city in Pennsylvania and the center of the Pittsburgh metropolitan area.
Dauphin County 279,874 County in Pennsylvania, United States