Jefferson County, Ohio

Founding: 1797
Parent county: Washington

Namesake: Thomas Jefferson, U.S. president
Seat: Steubenville (1797–)

Land area: 408 square miles

Population (2020): 65,249

Population (historic): 8,766 (1800); 25,030 (1840); 29,188 (1870); 44,357 (1900); 88,307 (1930)

Periods of population growth: pre-1800–1850; 1860–1940; 1950s

Subdivisions: Two cities; 17 villages; four CDPs; 14 townships

Pre-1940 residences (estimated): 8,366 (25.6%)
Pre-1940 housing survival rate: 36.3%
Pre-1860 housing survival rate (1940): 25%

Farm housing in disrepair (1950): 19.7%

Nonfarm housing in disrepair (1950): 9.9%

Average farmhouse value (1930): $1,461
Average outbuilding value (1930): $921
Average farmhouse value (1940): 5.8 rooms
Number of farms (1920): 1,866
Average farm size (1920): 76.1 acres
Sources of settlement: Pennsylvania, Virginia, Ireland, England, and Maryland
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Steubenville

Namesake: Fort Steuben, which once occupied the city's site

Founding: 1797 (platting); 1802 (post office); 1805 (incorporation)

Population (2020): 18,161

Population (historic): 731 (1800); 4,247 (1840); 12,093 (1880); 14,349 (1900); 35,422 (1930)

Periods of population growth: 1797–1940

Pre-1940 residences (estimated): 2,417 (26.5%)
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