Blair County, Pennsylvania

Founding: 1846
Parent counties: Bedford and Huntingdon

Namesake: John Blair, prominent local resident
Seat: Hollidaysburg (1846–)

Land area: 526 square miles

Population (2020): 122,822

Population (historic): 21,777 (1850); 38,051 (1870); 70,866 (1890); 108,858 (1910); 139,840 (1930)

Periods of population growth: pre-1850–1940; 1970s

Subdivisions: One city; eight boroughs; eight CDPs; 15 townships

Pre-1940 residences (estimated): 18,632 (32.9%)
Pre-1940 housing survival rate: 59.1%
Pre-1860 housing survival rate (1940): 28.7%

Farm housing in disrepair (1950): 10.6%

Nonfarm housing in disrepair (1950): 7.5%
Average farmhouse value (1930): $1,755
Average outbuilding value (1930): $1,671
Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 1,626
Average farm size (1920): 64.8 acres
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Hollidaysburg

Namesake: Adam and William Holliday, owners of the city site

Founding: 1796 (platting); 1805 (post office); 1836 (incorporation)

Population (2020): 5,641

Population (historic): 1,896 (1840); 2,469 (1860); 3,150 (1880); 2,998 (1900); 5,969 (1930)

Periods of population growth: pre-1840–1880; 1890–1930; 1940s; 2000s
Pre-1940 residences (estimated): 1,087 (35.2%)
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