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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Outstanding Buildings

1. Sunbrook / John Lloyd Estate (c. 1896). 2 Jennifer Road. Allegheny. Classical Revival.
2. William Dysart House (c. 1835). 161 Dysart Road. Antis. Federal.
3. Martin Bell Farm (1841). 2270 Old 6th Avenue. Antis. Federal.
4. Edward Bell House (1830). 449 Sabbath Rest Road. Antis. Federal.
5. Etna Furnace Ironmaster's House (c. 1805/1880). 9106 Fox Run Road. Catharine.
6. Etna Furnace Log Workers' Housing. Fox Run Road. Catharine.
7. John Stewart House (1836). 2071 William Penn Highway. Catharine. Federal.
8. Maxwell Kinkead House (c. 1813). 2877 Yellow Springs Road. Catharine. Federal.
9. Daniel Brua House (c. 1840/1875). 2681 Reservoir Road. Frankstown. Italianate.
10. Duffields–Coleman House (c. 1800/1825). 1028 Grandview Road. Logan.
11. Sinking Valley Presbyterian Church (1885). 6444 Kettle Road. Tyrone. Gothic Revival/Queen Anne.
12. Jacob Isett Farm (c. 1805). 6548 Kettle Road. Tyrone.
13. Jacob Isett Store (1799). 6548 Kettle Road. Tyrone. Federal.
14. St. John's Lutheran Church (1892). 548 Stevens Hill Road. Tyrone. Queen Anne.
15. Daniel Royer House (c. 1815/1840). 3920 Piney Creek Road. Woodbury.

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