Adams County, Pennsylvania



Founding: 1800
Parent county: York
Namesake: John Adams, U.S. president
Seat: Gettysburg (1800–)
Land area: 519 square miles
Population (2020): 103,852
Population (historic): 13,172 (1800); 23,044 (1840); 30,315 (1870); 34,496 (1900); 37,128 (1930)
Periods of population growth: pre-1800–1900; 1910–2020
Subdivisions: 13 boroughs; 14 CDPs; 21 townships
Pre-1940 residences (estimated): 8,309 (19.6%)
Pre-1940 housing survival rate: 85.8%
Pre-1860 housing survival rate (1940): 33.4%
Farm housing in disrepair (1950): 3%
Nonfarm housing in disrepair (1950): 2.4%
Average farmhouse value (1930): $1,673
Average outbuilding value (1930): $1,554
Average farmhouse size (1940): 7.4 rooms
Number of farms (1920): 3,451
Average farm size (1920): 63.3 acres
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Gettysburg

Namesake: Samuel Gettys, owner of the city site
Founding: 1786 (platting); 1796 (post office); 1806 (incorporation)
Population (2020): 7,106
Population (historic): 1,473 (1830); 3,074 (1870); 3,221 (1890); 4,030 (1910); 5,584 (1930)
Periods of population growth: pre-1830–1870; 1880–1960; 1990–2010
Pre-1940 residences (estimated): 1,503 (57%)
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