Pennsylvania Counties
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Pennsylvania Counties

There are sixty-seven counties of the Commonwealth of Pennsylvania in the United States of America. The city of Philadelphia is coterminous with Philadelphia County, and governmental functions have been consolidated since 1854.

Armstrong County, Pennsylvania

Armstrong County Education, Geography, and History

Armstrong County, Pennsylvania Courthouse

Armstrong County is a county located in the state of Pennsylvania. Based on the 2010 census, the population was 68,941. The county seat is Kittanning. The county was organized on March 12, 1800, from parts of Allegheny, Westmoreland and Lycoming Counties. It was named in honor of John Armstrong, who represented Pennsylvania in the Continental Congress and served as a major general during the Revolutionary War.

Armstrong County is included in the Pittsburgh, PA Metropolitan Statistical Area.

Etymology - Origin of Armstrong County Name

Named for John Armstrong (October 13, 1717 - March 9, 1795), an American civil engineer and soldier who served as a major general in the Revolutionary War. He was a delegate to the Continental Congress for Pennsylvania.


County QuickFacts: CensusBureau Quick Facts

Armstrong County History

Created on March 12, 1800, from parts of Allegheny, Westmoreland, and Lycoming Counties and was named for General John Armstrong. It was attached to Westmoreland County until 1805. Kittanning, the county seat was incorporated as a borough on April 2, 1821, and derived its name from a Delaware Indian village at the same place.

The area saw much fighting between settlers and Indians in the French and Indian War and Revolutionary War. John Armstrong's attack on the Indian village of Kittanning in 1756 proved that the Indians were not invincible. The territory was purchased from the Indians by the two Treaties of Fort Stanwix, 1768 (known as the New Purchase) and 1784 (known as the Last Purchase). The State's third ranked bituminous coal producing county, Armstrong also has produced glass, clay, brick, and quarried stone. Most of the coal mines are subsurface. A brief oil boom occurred after 1865, and natural gas was produced long afterwards. Steel production was once important, but declined by the 1930s. Armstrong's farming is strong in livestock and has a valuable mushroom crop. Thirty percent of the land is farmed.

Geography: Land and Water

As reported by the Census Bureau, the county has a total area of 664 square miles (1,721 km2), of which, 654 square miles (1,694 km2) of it is land and 11 square miles (27 km2) of it (1.58%) is water.

Neighboring Counties

Bordering counties are as follows:

  • Clarion County (north)
  • Jefferson County (northeast)
  • Indiana County (east)
  • Westmoreland County (south)
  • Allegheny County (southwest)
  • Butler County (west)
  • Venango County(northwest)


Colleges and universities

Indiana University of Pennsylvania Northpointe - South Buffalo Township

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