Indiana County, Pennsylvania

Founding: 1806 (declared in 1803)
Parent counties: Lycoming and Westmoreland

Namesake: A reference to the 1768 Treaty of Fort Stanwix
Seat: Indiana (1806–)

Land area: 827 square miles

Population (2020): 83,246

Population (historic): 6,214 (1810); 20,782 (1840); 36,138 (1870); 42,556 (1900); 75,395 (1930)

Periods of population growth: pre-1810–1920; 1930s; 1960–1980

Subdivisions: 14 boroughs; 11 CDPs; 24 townships

Pre-1940 residences (estimated): 9,984 (25.7%)
Pre-1940 housing survival rate: 54.7%
Pre-1860 housing survival rate (1940): 15.7%

Farm housing in disrepair (1950): 12.2%

Nonfarm housing in disrepair (1950): 8.8%
Average farmhouse value (1930): $1,537
Average outbuilding value (1930): $1,497
Average farmhouse size (1940): 6.2 rooms
Number of farms (1920): 3,935
Average farm size (1920): 70.6 acres
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Indiana

Namesake: Indiana County

Founding: 1805 (platting); 1810 (post office); 1816 (incorporation)

Population (2020): 14,044

Population (historic): 317 (1820); 963 (1850); 1,605 (1870); 4,142 (1900); 9,569 (1930)

Periods of population growth: pre-1820–1970; 2010s
Pre-1940 residences (estimated): 1,654 (32.1%)
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Outstanding Buildings

1. James Fleming Farm (c. 1845). 2320 Fleming Road. Armstrong. Federal.
2. Alexander Campbell Farm (1869). 558 Gobbler's Run Road. Armstrong. Italianate.
3. Robert Armstrong House (c. 1865). 75 Shelocta Road. Armstrong. Italianate/Gothic Revival.
4. Jacob Peelor House (c. 1820). 5815 US Highway 422. Armstrong. Federal.
5. John Archibald Farm (c. 1880). 1801 Grange Road. Black Lick. Italianate. Razed.
6. Alexander Rankin Farm (c. 1875). 1170 Mahan School Road. Black Lick. Italianate.
7. Isaac Hodge House (c. 1865). 700 High Rise Drive. Burrell. Italianate.
8. Walter George Farm (1885). 2675 Old State Route 56. Center. Italianate.
9. George Diehl Log House (c. 1840). 1807 Diehl Road. Cherry Hill.
10. James Leech Farm (c. 1855). 458 Leech Avenue. Conemaugh.
11. John Marshall Farm (c. 1790). 112 Tunnelton Road. Conemaugh.
12. Asa Croasmun House (c. 1860). 1720 Cherry Tree Road. Montgomery. Greek Revival.
13. House (c. 1860). 70 Mahoning Road. Montgomery. Greek Revival.
14. Robert McIsaac Farm (1868). 14682 US Highway 119. North Mahoning. Greek Revival.
15. James Smith Farm (c. 1885). 400 Grisemore Road. Pine. Queen Anne.
16. Lewis–McCormick Farm (c. 1820/1902–1905). 912 McCormick Road. South Mahoning. Romanesque/Classical Revival.
17. James Marshall Farm (c. 1875). 8328 State Route 85. South Mahoning. Italianate.
18. Daniel Davis House (1876). 2166 Davis Road. Washington. Italianate.
19. House (c. 1910). 549 Old US Highway 119. White. Classical Revival.
20. Robert McLanahan House (c. 1835). 2681 West Pike. White. Federal.
21. Daniel McCracken House (c. 1870). 29 Campbell Road. Young. Italianate. Razed.
22. Elder's Ridge Presbyterian Church (1878). Elder's Ridge Road and Iselin Road. Young. Gothic Revival/Romanesque. Razed.

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