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

National Register listings: 24

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.