Clermont County, Ohio

Founding: 1800
Parent county: Hamilton

Naming: A traditional name—French for "clear mountain"
Seats: Williamsburg (1800–1823); New Richmond (1823–1824); Batavia (1824–)

Land area: 452 square miles

Population (2020): 208,601

Population (historic): 9,965 (1810); 30,455 (1850); 36,713 (1880); 31,610 (1900); 29,786 (1930)

Periods of population growth: pre-1810–1880; 1920–2020

Subdivisions: Two cities; 11 villages; eight CDPs; 14 townships

Pre-1940 residences (estimated): 6,200 (7.6%)
Pre-1940 housing survival rate: 56.4%
Pre-1860 housing survival rate (1940): 29.7%

Farm housing in disrepair (1950): 7.7%

Nonfarm housing in disrepair (1950): 7.3%

Average farmhouse value (1930): $1,476
Average outbuilding value (1930): $963
Average farmhouse size (1940): 6 rooms
Number of farms (1920): 3,803
Average farm size (1920): 60.6 acres
Sources of settlement: Germany, Kentucky, Pennsylvania, Virginia, New Jersey, Ireland, and Maryland
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Batavia

Namesake: Batavia, New York

Founding: 1814 (platting); 1818 (post office); 1842 (incorporation)

Population (2020): 1,972

Population (historic): 208 (1820); 500 (1860); 1,029 (1900); 1,119 (1930)

Periods of population growth: 1814–1830; 1840–1880; 1890–1980; 2010s
Pre-1940 residences (estimated): 265 (31.5%)
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