Delaware County, Ohio

Founding: 1808
Parent county: Franklin

Namesake: The Delaware people
Seat: Delaware (1808–)

Land area: 443 square miles

Population (2020): 214,124

Population (historic): 2,000 (1810); 21,817 (1850); 27,381 (1880); 26,016 (1930)

Periods of population growth: 1810–1840; 1850–1880; 1940–2020

Subdivisions: Three cities; five villages; two CDPs; 18 townships

Pre-1940 residences (estimated): 4,771 (7%)
Pre-1940 housing survival rate: 64.4%
Pre-1860 housing survival rate (1940): 15.4%

Farm housing in disrepair (1950): 4.1%

Nonfarm housing in disrepair (1950): 6.7%
Average farmhouse value (1930): $1,677
Average outbuilding value (1930): $1,298
Average farmhouse size (1940): 6.8 rooms
Number of farms (1920): 2,922
Average farm size (1920): 78.6 acres
Sources of settlement: Pennsylvania, New York, Virginia, Ireland, New Jersey, Germany, and Wales
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Delaware

Namesake: The Delaware people

Founding: 1808 (platting); 1811 (post office); 1816 (incorporation)

Population (2020): 41,302

Population (historic): 200 (1810); 2,074 (1850); 6,894 (1880); 8,675 (1930)

Periods of population growth: 1810–1890; 1900s; 1940–1980; 1990–2020
Pre-1940 residences (estimated): 1,967 (13%)
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