Seneca County, Ohio

Founding: 1824 (declared in 1820)
Parent county: Unorganized territory

Namesake: The Seneca people
Seat: Tiffin (1824–)

Land area: 551 square miles

Population (2020): 55,069

Population (historic): 5,159 (1830); 30,868 (1860); 41,163 (1900); 47,941 (1930)

Periods of population growth: 1820–1860; 1870–1980

Subdivisions: Two cities; six villages; seven CDPs; 15 townships

Pre-1940 residences (estimated): 8,857 (36.9%)
Pre-1940 housing survival rate: 71.7%
Pre-1860 housing survival rate (1940): 22.4%

Farm housing in disrepair (1950): 3.4%

Nonfarm housing in disrepair (1950): 5%
Average farmhouse value (1930): $2,021
Average outbuilding value (1930): $2,109

Average farmhouse size (1940): 7.5 rooms
Number of farms (1920): 3,113
Average farm size (1920): 89.9 acres
Sources of settlement: Pennsylvania, Germany, Maryland, and New York
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Tiffin

Namesake: Edward Tiffin, Ohio governor

Founding: 1821 (platting); 1825 (post office); 1835 (incorporation)

Population (2020): 17,953

Population (historic): 248 (1830); 3,992 (1860); 10,989 (1900); 16,428 (1930)

Periods of population growth: 1821–1930; 1940–1970

Pre-1940 residences (estimated): 2,872 (37.8%)
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