Armstrong County , Pennsylvania

Armstrong County: County in Pennsylvania, United States

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


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 9 years in 2019 county had an estimated population of 64,735 inhabitants. Its county seat is Kittanning. The county was created 221 years ago in 1800.


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.

Kittanning Courthouse image
Kittanning Courthouse

The largest city of Armstrong County is Milton with a population of 6,595. Other cities include, Ford City population 2,764, Kittanning population 2,153, Apollo population 1,523 and North Apollo population 1,201. See all Armstrong County cities & populated places.

Kittanning Courthouse image

Armstrong County map

Armstrong County Quick Facts

Population : 64,735 (2019)
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 : 07:15:53 (16th June 2021)
Density : 38 Pop. per km² as of 2019
Population growth : -6.5% (2010-2019)

Armstrong County has 6 neighbours.


According to census records, the population of Armstrong County decreased by 6.5% in 9 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

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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, you can see a list of people who born in Armstrong County.

Other places with the same name (1)

Armstrong County Populated Places (more)

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

City Name Population Title
Milton 6,595 Borough in northwestern Northumberland County, Pennsylvania
North Buffalo 2,889 Township of Pennsylvania
Ford City 2,764 Borough of Pennsylvania
Kittanning 2,153 Borough of Pennsylvania
Apollo 1,523 Borough of Pennsylvania
North Apollo 1,201 Borough of Pennsylvania
Williamsburg 1,177 Borough of Pennsylvania
South Bend 1,097 Township in Armstrong County, Pennsylvania
West Kittanning 1,090 Borough of Pennsylvania
Adams 912 Community in Armstrong County, Pennsylvania, United States
Rural Valley 814 Borough of Pennsylvania
Bradys Bend 714 Township in Armstrong County, Pennsylvania
Brownstown 677 Borough in Cambria County, Pennsylvania
Greenville 632 Borough in Mercer County, Pennsylvania, United States
Parker 608 City in Armstrong County, Pennsylvania
Worthington 589 Borough of Pennsylvania

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
Allegheny County 1,216,045 County in the southwestern part of the U.
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

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