Oswego County, New York

Founding: 1816
Parent counties: Oneida and Onondaga
Namesake: The Oswego River
Seat: Oswego (1816–)
Land area: 952 square miles
Population (2020): 117,525
Population (historic): 12,374 (1820); 62,198 (1850); 77,941 (1870); 70,881 (1900); 69,645 (1930)
Periods of population growth: pre-1820–1870; 1900s; 1930–2000
Subdivisions: Two cities; nine villages; six CDPs; 22 towns
National Register listings: 95
Pre-1940 residences (estimated): 14,626 (26.7%)
Pre-1940 housing survival rate: 76.5%
Pre-1860 housing survival rate (1940): 23.9%

Farm housing in disrepair (1950): 8.5%

Nonfarm housing in disrepair (1950): 6.2%

Average farmhouse value (1930): $1,470
Average outbuilding value (1930): $1,139

Average farmhouse size (1940): 7.5 rooms

Number of farms (1920): 5,539
Average farm size (1920): 49 acres
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Oswego

 
Namesake: Fort Oswego, which once occupied the city site
Founding: 1796 (founding); 1816 (post office); 1828 (incorporation)
Population (2020): 16,921
Population (historic): 12,205 (1850); 20,910 (1870); 21,842 (1890); 23,368 (1910); 22,652 (1930)
Periods of population growth: pre-1850–1920; 1940s; 2000s
Pre-1940 residences (estimated): 4,930 (58.1%)
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Outstanding Buildings

1. Oliver Payne Farm (c. 1865). 316 South Granby Road. Granby. Italianate.
2. Augustus Gardiner Farm (c. 1865). 177 State Route 176. Hannibal. Italianate.
3. *Phineas Davis House (1874). 57 North Street. Mexico. Italianate.
4. *Richard Jerrett House (1874–1877). 4566 State Route 104. New Haven. Italianate.
5. *Thaddeus Brigham House (c. 1870). 7251 State Route 104. Oswego. Gothic Revival.
6. *Thaddeus Brigham House (c. 1860). 7263 State Route 104. Oswego. Gothic Revival.
7. Farm (c. 1870). 222 Chesbro Road. Schroeppel. Italianate.
8. *Henry Schroeppel House (1818). 1 County Road 10. Schroeppel. Greek Revival.
9. Nelson Corey Farm (c. 1865). 135 Godfrey Road. Schroeppel. Italianate.
10. *Volkert Van Buren House (c. 1832). 2981 County Road 57. Volney. Federal.
11. *David Van Buren House (1847). 50 Van Buren Drive. Volney. Greek Revival.
12. William Storey House (c. 1865). 181 State Route 13. Williamstown. Italianate.