Carroll County, Indiana

Founding: 1828
Parent county: Unorganized territory

Namesake: Charles Carroll, Maryland politician
Seat: Delphi (1828–)

Land area: 372 square miles

Population (2020): 20,306

Population (historic): 1,611 (1830); 13,489 (1860); 18,345 (1880); 19,953 (1900); 15,049 (1930)

Periods of population growth: pre-1830–1890; 1930–1980; 1990–2020

Subdivisions: One city; four cities; 14 townships

National Register listings: 31

Pre-1940 residences (estimated): 2,831 (29.7%)
Pre-1940 housing survival rate: 59.6%
Pre-1860 housing survival rate (1940): 12.2%

Farm housing in disrepair (1950): 3.2%

Nonfarm housing in disrepair (1950): 4.2%

Average farmhouse value (1930): $1,619
Average outbuilding value (1930): $1,551

Average farmhouse size (1940): 6.9 rooms
Number of farms (1920): 2,075
Average farm size (1920): 94.2 acres
Sources of settlement: Ohio and Pennsylvania

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Delphi

Namesake: Delphi, Greece

Founding: 1828 (platting); 1828 (post office)

Population (2020): 2,961

Population (historic): 1,381 (1850); 1,614 (1870); 2,135 (1900); 1,929 (1930)

Periods of population growth: pre-1850–1880; 1890–1910; 1930–1950; 1960–1980; 1990s; 2010s
Pre-1940 residences (estimated): 546 (39.5%)

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Outstanding Buildings

1. Schneib Farm (c. 1840). 3729 West Towpath Road. Adams. Razed.
2. House (c. 1860). 1764 State Route 29. Carrollton. Gothic Revival. Razed.
3. Jerome Shipley Farm (1882). 5316 West 500S. Clay. Italianate.
4. John Hufford House (c. 1890). 3908 West 750S. Clay. Italianate/Eastlake.
5. *Mears House (1852). 6405 West 300N. Deer Creek. Greek Revival/Gothic Revival.
6. William Whistler House (1862). 3921 West 600N. Deer Creek.
7. Andrew McDonald House (c. 1865). 6726 Milkhouse Road. Deer Creek. Gothic Revival.
8. Frederick Raber Farm (1904–1905). 4071 State Route 218. Deer Creek. Classical Revival.
9. *Adams Mill (1845–1846). South 75E. Democrat.
10. Firman House (c. 1855). 1555 East 500S. Democrat. Italianate.
11. Gilbert Gates House (1905). 7433 West 1100N. Jefferson. Queen Anne.
12. John Shaffer House (1873). 3847 West 200S. Madison. Italianate.
13. House (1849). West 1050N. Rock Creek. Greek Revival/Italianate.
14. Greenup House (1859). Bicycle Bridge Road. Tippecanoe. Italianate.