Highland County, Ohio

Founding: 1805
Parent counties: Adams, Clermont, and Ross

Namesake: The county's elevated terrain
Seats: New Market (1805–1807); Hillsboro (1807–)

Land area: 553 square miles

Population (2020): 43,317

Population (historic): 5,766 (1810); 25,781 (1850); 30,281 (1880); 25,416 (1930)

Periods of population growth: pre-1810–1880; 1890s; 1930–1960; 1970–2010

Subdivisions: One city; six villages; three CDPs; 17 townships

Pre-1940 residences (estimated): 3,786 (19.6%)
Pre-1940 housing survival rate: 52%
Pre-1860 housing survival rate (1940): 20.7%

Farm housing in disrepair (1950): 12.1%

Nonfarm housing in disrepair (1950): 10.6%
Average farmhouse value (1930): $1,159
Average outbuilding value (1930): $872
Average farmhouse size (1940): 6.3 rooms
Number of farms (1920): 3,338
Average farm size (1920): 88.7 acres
Sources of settlement: Virginia, Pennsylvania, Ireland, and France
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Hillsboro

Named for: The city's rolling terrain

Founding: 1807 (platting); 1809 (post office)

Population (2020): 6,481

Population (historic): 220 (1810); 1,021 (1840); 3,234 (1880); 4,040 (1930)

Periods of population growth: 1807–1900; 1910s; 1930–1980; 1990–2010
Pre-1940 residences (estimated): 967 (29.7%)

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