Seneca County, New York

Founding: 1804
Parent county: Cayuga

Namesake: The Seneca people
Seats: Ovid (1804–) and Waterloo (1819–)

Land area: 324 square miles

Population (2020): 33,814

Population (historic): 16,609 (1810); 24,874 (1840); 27,823 (1870); 28,114 (1900); 24,983 (1930)

Periods of population growth: pre-1810–1820; 1830–1860; 1870s; 1920–1970; 2000s

Subdivisions: Four villages; two CDPs; ten towns

Pre-1940 residences (estimated): 5,702 (35%)
Pre-1940 housing survival rate: 85.7%
Pre-1860 housing survival rate (1940): 20.4%

Farm housing in disrepair (1950): 7.6%

Nonfarm housing in disrepair (1950): 6.2%

Average farmhouse value (1930): $2,113
Average outbuilding value (1930): $2,083

Average farmhouse size (1940): 8 rooms
Number of farms (1920): 1,857
Average farm size (1920): 86.3 acres
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Ovid

Namesake: Ovid, Roman poet

Founding: 1802 (post office); 1816 (incorporation)

Population (2020): 534

Population (historic): 760 (1860); 705 (1880); 624 (1900); 537 (1930)

Periods of population growth: pre-1860; 1920–1960
Pre-1940 residences (estimated): 163 (55.4%)
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Waterloo

Namesake: Waterloo, Belgium

Founding: 1807 (platting); 1824 (incorporation); 1828 (post office)

Population (2020): 4,810

Population (historic): 3,375 (1860); 3,893 (1880); 4,256 (1900); 4,047 (1930)

Periods of population growth: pre-1860–1870; 1880s; 1920s; 1940–1970; 2000s
Pre-1940 residences (estimated): 965 (43.1%)
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