Nassau County, New York

Founding: 1899
Parent county: Queens
Namesake: The House of Nassau
Seat: Mineola (1899–)
Land area: 285 square miles
Population (2020): 1,395,774
Population (historic): 55,448 (1900); 126,120 (1920); 303,053 (1930)
Periods of population growth: pre-1900–1970; 1990–2020
Subdivisions: Two cities; 62 villages; 69 CDPs; three towns
National Register listings: 150
Pre-1940 residences (estimated): 96,663 (20.2%)
Pre-1940 housing survival rate: 73.2%

Farm housing in disrepair (1950): 2.9%

Nonfarm housing in disrepair (1950): 1.9%

Average farmhouse value (1930): $6,097
Average outbuilding value (1930): $6,570

Average farmhouse size (1940): 6.6 rooms

Number of farms (1920): 935
Average farm size (1920): 46.1 acres
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Mineola

 
Namesake: Miniolagamika, Algonquin chief
Founding: 1858 (post office); 1906 (incorporation)
Population (2020): 20,800
Population (historic): 313 (1880); 1,981 (1910); 3,016 (1920); 8,155 (1930)
Periods of population growth: pre-1910–1970; 1990s; 2010s
Pre-1940 residences (estimated): 2,469 (28.9%)
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Outstanding Buildings

1. *Clapham–Stern House (c. 1870/1906). 48 Glenwood Road. North Hempstead. Victorian Gothic.
2. *Horatio Onderdonk House (1836). 1471 Northern Boulevard. North Hempstead. Greek Revival.
3. *George Denton House (c. 1874). 57 West Shore Road. North Hempstead. Italianate.
4. *George Swan Estate (1859). 40 Cove Neck Road. Oyster Bay. Second Empire.
5. *Frank Woolworth Estate (1916). 77 Crescent Beach Road. Oyster Bay. Renaissance Revival.
6. *Crowell House (1871). 375 Littleworth Lane. Oyster Bay. Second Empire.
7. *Coe Hall / William Coe Estate (1918–1921). 1395 Planting Fields Road. Oyster Bay. Tudor Revival.
8. *Sagamore Hill / Theodore Roosevelt Estate (1884). 20 Sagamore Hill Road. Oyster Bay. Queen Anne.
9. *Elmwood / Thomas Youngs House (1836). 24 Tiffany Road. Oyster Bay. Greek Revival.
10. *James Beekman House (1863–1864). 1026 West Shore Road. Oyster Bay. Gothic Revival.
11. *Seawanhaka Yacht Club (1891). 314 Yacht Club Road. Oyster Bay. Classical Revival.