Rensselaer County, New York

Founding: 1791
Parent county: Albany
Namesake: Rensselaerswyck, estate of the Van Rensselaer family
Seat: Troy (1793–)
Land area: 652 square miles
Population (2020): 161,130
Population (historic): 30,442 (1800); 60,259 (1840); 99,549 (1870); 121,697 (1900); 119,781 (1930)
Periods of population growth: pre-1800–1890; 1900s; 1920–1970; 1980s; 2000–2020

Subdivisions: Two cities; six villages; seven CDPs; 14 towns
Pre-1940 residences (estimated): 21,695 (29.5%)
Pre-1940 housing survival rate: 67.8%
Pre-1860 housing survival rate (1940): 30.5%

Farm housing in disrepair (1950): 8.5%

Nonfarm housing in disrepair (1950): 5.1%

Average farmhouse value (1930): $2,446
Average outbuilding value (1930): $1,640

Average farmhouse size (1940): 7.5 rooms

Number of farms (1920): 3,078
Average farm size (1920): 64.8 acres
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Troy

 
Namesake: The ancient city of Troy
Founding: pre-1789 (founding); 1795 (post office); 1801 (incorporation)
Population (2020): 51,401
Population (historic): 5,264 (1820); 28,785 (1850); 46,465 (1870); 60,651 (1900); 72,763 (1930)
Periods of population growth: pre-1820–1890; 1900s; 1920s; 1940s; 2000–2020

Pre-1940 residences (estimated): 12,889 (54.7%)
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