Jefferson County, New York

Founding: 1805
Parent county: Oneida
Namesake: Thomas Jefferson, U.S. president
Seat: Watertown (1805–)
Land area: 1,269 square miles
Population (2020): 116,721
Population (historic): 15,140 (1810); 60,984 (1840); 65,415 (1870); 76,748 (1900); 83,574 (1930)
Periods of population growth: pre-1810–1860; 1870–1970; 1980–2020
Subdivisions: One city; 19 villages; 21 CDPs; 22 towns
National Register listings: 148
Pre-1940 residences (estimated): 19,824 (33.1%)
Pre-1940 housing survival rate: 73.4%
Pre-1860 housing survival rate (1940): 26.7%

Farm housing in disrepair (1950): 9.7%

Nonfarm housing in disrepair (1950): 5.9%

Average farmhouse value (1930): $1,766
Average outbuilding value (1930): $2,190
Average farmhouse size (1940): 8.3 rooms
Number of farms (1920): 5,151
Average farm size (1920): 88 acres
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Watertown

 
Namesake: A reference to the Black River, which bisects the city
Founding: 1800 (founding); 1804 (post office); 1816 (incorporation)
Population (2020): 24,685
Population (historic): 9,336 (1870); 14,725 (1890); 26,730 (1910); 32,205 (1930)
Periods of population growth: pre-1870–1950; 1980s; 2000s
Pre-1940 residences (estimated): 6,989 (53%)
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Outstanding Buildings

1. Fuller House (c. 1870). 14445 Fuller Road. Adams. Italianate.
2. Farm (c. 1875). 16538 South Shore Road. Brownville. Italianate.
3. House (c. 1875). 19610 South Shore Road. Brownville. Italianate.
4. *Louis Peugnet Farm (c. 1837). 32089 Tibbett's Point Road. Cape Vincent.
5. *Chester Norton House (1818). 8748 State Route 178. Henderson. Federal.
6. Farm (c. 1890). 12819 State Route 178. Henderson. Queen Anne.
7. *Stephen Simmons House (c. 1818). 14739 Sulphur Springs Road. Hounsfield. Federal.
8. *Shore Farm / Luff–Wardwell Farm (c. 1822/1895). 19880 Wardwell Drive. Hounsfield. Classical Revival.
9. *James LeRay House (1806–1808/1820s). 69 LeRay Drive. LeRay. Greek Revival/Federal.
10. Andrew Middleton Farm (c. 1830). 217 Middleton Road. Rutland. Greek Revival.
11. *John Losee House (c. 1828). 17100 Dry Hill Road. Watertown. Federal.