Ontario County, New York

Founding: 1789
Parent county: Montgomery
Namesake: Lake Ontario
Seat: Canandaigua (1789–)
Land area: 644 square miles
Population (2020): 112,458
Population (historic): 1,075 (1790); 43,501 (1840); 45,108 (1870); 49,605 (1900); 54,276 (1930)
Periods of population growth: 1790–1880; 1890–2020

Subdivisions: Two cities; eight villages; three CDPs; 16 towns
Pre-1940 residences (estimated): 14,687 (28.4%)
Pre-1940 housing survival rate: 86.5%
Pre-1860 housing survival rate (1940): 34.3%

Farm housing in disrepair (1950): 5.3%

Nonfarm housing in disrepair (1950): 5.2%

Average farmhouse value (1930): $2,433
Average outbuilding value (1930): $2,442

Average farmhouse size (1940): 8 rooms

Number of farms (1920): 4,062
Average farm size (1920): 73 acres
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Canandaigua

 
Namesake: A Seneca village near the city site
Founding: circa 1789 (founding); 1794 (post office); 1815 (incorporation)
Population (2020): 10,576
Population (historic): 450 (1810); 2,790 (1840); 4,862 (1870); 6,151 (1900); 7,541 (1930)
Periods of population growth: pre-1810–1970; 1980–2000; 2010s

Pre-1940 residences (estimated): 2,340 (43%)
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