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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Outstanding Buildings

Gilead Lutheran Church (1865). 308 Brick Church Road. Brunswick. Romanesque.
School Number Two (1881). 605 Brunswick Road. Brunswick. Stick.
Farm (c. 1790). 191 Flower Road. Brunswick. Federal.
Martin Bornt Farm (c. 1835). Lockrow Road, west of Windy Acres Road. Brunswick. Greek Revival.
Morrison Farm (c. 1830). 3482 State Route 2. Brunswick. Federal.
Irwin House (1859). 6 Eileen Drive. East Greenbush. Italianate.
Edmond-Charles Genêt House (c. 1810). 868 Ridge Road. East Greenbush. Federal.
Herrington Farm (c. 1855). 1490 Buskirk–West Hoosick Road. Hoosick. Greek Revival.
John Joslin Farm (c. 1855). 1892 Buskirk–West Hoosick Road. Hoosick. Greek Revival.
George Tibbits House (c. 1860). 14 Hoosac School Way. Hoosick. Gothic Revival.
Breese House (c. 1825). 601 South Street. Hoosick. Federal.
House (1886). 22017 State Route 22. Hoosick. Queen Anne.
Gerrit Breese Farm (c. 1835). 22420 State Route 22. Hoosick. Federal.
Joseph Phillips House (1843). 401 Blooming Grove Drive. North Greenbush. Greek Revival.
Beverwyck / William Van Rensselaer House (1839–1842). 75 St. Francis Place. North Greenbush. Greek Revival.
House (c. 1875). 19191 State Route 22. Petersburgh. Second Empire.
Reynolds House (c. 1820). 19608 State Route 22. Petersburgh. Federal.
Green Farm (c. 1900). 34 State Route 346. Petersburgh. Classical Revival.
House (c. 1895). 1342 Johnsonville Road. Pittstown. Queen Anne.
Wiley Farm (c. 1835/1865). 930 Melrose–Valley Falls Road. Pittstown. Greek Revival.
Link House (c. 1820). 9206 Averill Park Road. Poestenkill. Federal.
Joseph Mosher Farm (c. 1835). 253 Bell Road. Schaghticoke. Federal.
Johannes Knickerbocker House (c. 1770). 132 Knickerbocker Road. Schaghticoke. Georgian.
Abel Welling Farm (c. 1855). 190 Schweninger Road. Schaghticoke. Greek Revival.
Elmbrook Farm / Lansing Farm (c. 1830/1850). 2567 Brookview Road. Schodack. Italianate/Greek Revival.
Elijah Budd House (c. 1820). 305 Bunker Hill Road. Schodack. Federal.
House (18th century). 732 River Road. Schodack.
Vanderburgh House (c. 1835/1865). 1110 River Road. Schodack. Italianate.
Abraham Van Valkenburgh House (c. 1800). 1194 River Road. Schodack. Federal.
Joachim Staats House (1696). 150 Staats Island Road. Schodack.