Armstrong County, Pennsylvania

Armstrong County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 65,558. 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
Armstrong County Courthouse
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°49′N 79°28′W
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
Pennsylvania Historical Marker
DesignatedOctober 15, 1982

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

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