Monroe County, New York

Founding: 1821
Parent counties: Genesee and Ontario
Namesake: James Monroe, U.S. president
Seat: Rochester (1821–)
Land area: 657 square miles
Population (2020): 759,443
Population (historic): 49,855 (1830); 87,650 (1850); 117,868 (1870); 217,854 (1900); 423,881 (1930)
Periods of population growth: pre-1830–1970; 1980–2020
Subdivisions: One city; nine villages; six CDPs; 20 towns
Pre-1940 residences (estimated): 82,656 (25.1%)
Pre-1940 housing survival rate: 64.6%
Pre-1860 housing survival rate (1940): 32.1%

Farm housing in disrepair (1950): 5%

Nonfarm housing in disrepair (1950): 2.9%

Average farmhouse value (1930): $3,528
Average outbuilding value (1930): $3,046

Average farmhouse size (1940): 7.7 rooms

Number of farms (1920): 5,174
Average farm size (1920): 60.9 acres
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Rochester

 
Namesake: Nathaniel Rochester, land speculator
Founding: 1811 (platting as Rochesterville); 1812 (post office); 1817 (incorporation)
Population (2020): 211,328
Population (historic): 1,502 (1820); 20,191 (1840); 62,386 (1870); 162,608 (1900); 328,132 (1930)
Periods of population growth: 1811–1930; 2010s
Pre-1940 residences (estimated): 54,342 (54.2%)
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