Sullivan County, New York

Founding: 1809
Parent county: Ulster
Namesake: John Sullivan, Continental Army general
Seat: Monticello (1809–)
Land area: 968 square miles
Population (2020): 78,624
Population (historic): 6,108 (1810); 15,629 (1840); 34,550 (1870); 32,306 (1900); 35,272 (1930)
Periods of population growth: pre-1810–1870; 1890–1910; 1920–2020

Subdivisions: Six villages; 25 CDPs; 15 towns
National Register listings: 82
Pre-1940 residences (estimated): 11,314 (22.3%)
Pre-1940 housing survival rate: 42.8%
Pre-1860 housing survival rate (1940): 15%

Farm housing in disrepair (1950): 5.6%

Nonfarm housing in disrepair (1950): 3.4%

Average farmhouse value (1930): $4,321
Average outbuilding value (1930): $3,128
Average farmhouse size (1940): 6.5 rooms
Number of farms (1920): 3,543
Average farm size (1920): 43.6 acres
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Monticello

 
Namesake: Monticello, Thomas Jefferson's estate
Founding: 1804 (platting); 1811 (post office); 1830 (incorporation)
Population (2020): 7,173
Population (historic): 912 (1870); 1,016 (1890); 1,941 (1910); 3,450 (1930)
Periods of population growth: pre-1870–1990; 2000–2020
Pre-1940 residences (estimated): 797 (25.4%)
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Outstanding Buildings

1. Olney Borden Farm (c. 1845). 173 Esselman Road. Callicoon. Greek Revival.
2. *Elias Page House (1892/1905). 59 C. Meyer Road. Cohecton. Queen Anne.
3. *Glen Wild Methodist Church (1867). 143 Old Glen Wild Road. Fallsburg. Gothic Revival.
4. *Craig-e Clair / Ralph Wurts-Dundas Castle (1915–1924). 609 Craig-e Clair Road. Rockland. English Revival.