Armstrong County, Pennsylvania

Armstrong County
Armstrong County Courthouse
Armstrong County Courthouse
Official seal of Armstrong County
Map of Pennsylvania highlighting Armstrong County
Location within the U.S. state of Pennsylvania
Map of the United States highlighting Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°49′N 79°28′W / 40.81°N 79.46°W / 40.81; -79.46
Country United States
State Pennsylvania
FoundedMarch 12, 1800
Named forJohn Armstrong
SeatKittanning
Largest boroughKittanning
Area
 • Total664 sq mi (1,720 km2)
 • Land653 sq mi (1,690 km2)
 • Water11 sq mi (30 km2)  1.6%
Population
 (2020)
 • Total65,558
 • Density100/sq mi (40/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district15th
Websitewww.co.armstrong.pa.us
DesignatedOctober 15, 1982[1]

Armstrong County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 65,558.[2] The county seat is Kittanning.[3] 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.

The county is part of the Greater Pittsburgh region of the state.[a]

  1. ^ "PHMC Historical Markers Search" (Searchable database). Pennsylvania Historical and Museum Commission. Commonwealth of Pennsylvania. Retrieved January 25, 2014.
  2. ^ "Census - Geography Profile: Armstrong County, Pennsylvania". United States Census Bureau. Retrieved April 24, 2022.
  3. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.


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