Clark County, Ohio

Founding: 1818
Parent counties: Champaign, Greene, and Madison

Namesake: George Rogers Clark, Virginia militia officer
Seat: Springfield (1818–)

Land area: 397 square miles

Population (2020): 136,001

Population (historic): 9,533 (1820); 22,178 (1850); 41,948 (1880); 58,939 (1900); 90,936 (1930)

Periods of population growth: pre-1820–1970

Subdivisions: Two cities; eight villages; five CDPs; 10 townships

Pre-1940 residences (estimated): 15,163 (24.8%)
Pre-1940 housing survival rate: 54.9%
Pre-1860 housing survival rate (1940): 30.1%

Farm housing in disrepair (1950): 3.7%

Nonfarm housing in disrepair (1950): 5.2%
Average farmhouse value (1930): $2,191
Average outbuilding value (1930): $1,784
Average farmhouse size (1940): 6.8 rooms
Number of farms (1920): 2,487
Average farm size (1920): 82.1 acres
Sources of settlement: Pennsylvania, Virginia, Maryland, Ireland, and Germany
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Springfield

Naming: A traditional name

Founding: 1801 (platting); 1804 (post office); 1827 (incorporation)

Population (2020): 58,662

Population (historic): 593 (1810); 5,108 (1850); 20,730 (1880); 68,743 (1930)

Periods of population growth: 1801–1820; 1830–1960
Pre-1940 residences (estimated): 11,752 (41.2%)

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