Armstrong County, Pennsylvania

Founding: 1805 (declared in 1800)
Parent counties: Allegheny, Lycoming, and Westmoreland

Namesake: John Armstrong, Continental Army general
Seat: Kittanning (1800–)

Land area: 653 square miles

Population (2020): 65,558

Population (historic): 2,399 (1800); 17,701 (1830); 35,797 (1860); 46,747 (1890); 79,298 (1930)

Periods of population growth: pre-1800–1880; 1890–1940; 1970s

Subdivisions: One city; 16 boroughs; seven CDPs; 28 townships

Pre-1940 residences (estimated): 10,506 (32.1%)
Pre-1940 housing survival rate: 56.9%
Pre-1860 housing survival rate (1940): 8.3%

Farm housing in disrepair (1950): 10.6%

Nonfarm housing in disrepair (1950): 7.1%
Average farmhouse value (1930): $1,559
Average outbuilding value (1930): $1,247
Average farmhouse size (1940): 6.1 rooms
Number of farms (1920): 3,771
Average farm size (1920): 64.1 acres
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Kittanning

Namesake: A Lenape village which formerly occupied the site

Founding: circa 1800 (founding); 1803 (incorporation); 1807 (post office)

Population (2020): 3,921

Population (historic): 318 (1820); 1,561 (1850); 1,889 (1870); 3,902 (1900); 7,808 (1930)

Periods of population growth: pre-1810–1930; 1940s
Pre-1940 residences (estimated): 1,236 (51.7%)
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