Knox County, Ohio

Founding: 1808
Parent counties: Fairfield and Franklin

Namesake: Henry Knox, Continental Amy general
Seat: Mount Vernon (1808–)

Land area: 525 square miles

Population (2020): 62,721

Population (historic): 2,149 (1810); 29,579 (1840); 26,333 (1870); 27,768 (1900); 29,338 (1930)

Periods of population growth: pre-1810–1840; 1870–1910; 1930–2020

Subdivisions: One city; eight villages; two CDPs; 22 townships

Pre-1940 residences (estimated): 6,375 (25.2%)
Pre-1940 housing survival rate: 68.2%
Pre-1860 housing survival rate (1940): 18.9%

Farm housing in disrepair (1950): 5.9%

Nonfarm housing in disrepair (1950): 4.4%
Average farmhouse value (1930): $1,438
Average outbuilding value (1930): $1,283
Average farmhouse size (1940): 7.2 rooms
Number of farms (1920): 3,108
Average farm size (1920): 83 acres
Sources of settlement: Pennsylvania, Maryland, Virginia, New York, New Jersey, and England
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Mount Vernon

Namesake: Mount Vernon, George Washington's plantation

Founding: 1805 (platting); 1809 (post office); 1830 (incorporation)

Population (2020): 16,956

Population (historic): 314 (1810); 3,711 (1850); 5,249 (1880); 6,638 (1900); 9,370 (1930)

Periods of population growth: 1805–2010
Pre-1940 residences (estimated): 2,078 (27.7%)
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