Ross County, Ohio

Founding: 1798
Parent counties: Adams, Hamilton, and Washington

Namesake: James Ross, Pennsylvania senator
Seat: Chillicothe (1798–)

Land area: 689 square miles

Population (2020): 77,093

Population (historic): 8,540 (1800); 32,074 (1850); 40,307 (1880); 40,940 (1900); 45,181 (1930)

Periods of population growth: pre-1800–1880; 1890s; 1910–1960; 1970–2010

Subdivisions: One city; six villages; three CDPs; 16 townships

Pre-1940 residences (estimated): 6,551 (20.5%)
Pre-1940 housing survival rate: 50%
Pre-1860 housing survival rate (1940): 22.5%

Farm housing in disrepair (1950): 18.9%

Nonfarm housing in disrepair (1950): 10.4%

Average farmhouse value (1930): $1,278
Average outbuilding value (1930): $1,006

Average farmhouse size (1940): 5.3 rooms
Number of farms (1920): 2,949
Average farm size (1920): 92.5 acres
Sources of settlement: Virginia, Pennsylvania, and Germany
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Chillicothe

Namesake: The Chalahgawtha branch of the Shawnee people

Founding: 1796 (platting); 1799 (post office); 1802 (incorporation)

Population (2020): 22,059

Population (historic): 2,426 (1820); 7,100 (1850); 10,938 (1880); 12,976 (1900); 18,340 (1930)

Periods of population growth: pre-1820–1940; 1950s; 2000–2020
Pre-1940 residences (estimated): 3,513 (33.6%)
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