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

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); 1835 (incorporation)

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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