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

National Register listings: 30

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.