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

National Register listings: 27

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, Northern 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)

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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Outstanding Buildings

1. *Benjamin Coe House (c. 1875). 803 Canton Road. Island Creek. Italianate.
2. David Shelley House (c. 1835). 403 Township Road 241. Knox.
3. *William Van Tilburg House (c. 1868). 613 Sugar Grove Road. Knox. Italianate.
4. *Penrose Hussey Farm (c. 1848/1890). 3232 State Route 150. Mount Pleasant. Italianate.
5. Kithcart Farm (c. 1830). 1521 County Road 1. Mount Pleasant. Federal.
6. *George Clark House (c. 1832/1880). 2004 State Route 150. Mount Pleasant. Italianate.
7. James Shane House (c. 1835). 3568 State Park–Mooretown Road. Ross.
8. John Copeland House (c. 1875). 5840 State Route 646. Salem. Italianate.
9. *John Culp House (1868). 1706 Sugar Grove Road. Saline. Italianate.
10. *Robert Henderson Farm (1872). 103 Pine Valley Road. Smithfield. Italianate/Gothic Revival.
11. *Thomas Hamilton Farm (c. 1850). 7128 Smithfield–Adena Road. Smithfield. Greek Revival/Italianate.
12. *Cope Farm (1882). 302 State Route 151. Smithfield. Italianate.
13. Nathan Hussey Farm (c. 1850). 4122 Township Road 120. Smithfield. Greek Revival.
14. Nathan Hayne House (c. 1830). Township Road 130. Smithfield.
15. *Daniel Tarr House (c. 1830). 601 Keeper Road. Wells.