Jefferson County, Kentucky

Founding: 1780
Parent county: Kentucky County, Virginia

Namesake: Thomas Jefferson, U.S. president
Seat: Louisville (1800–)

Land area: 380 square miles

Population (2020): 782,969

Population (historic): 4,765 (1790); 23,979 (1830); 89,404 (1860); 188,598 (1890); 355,350 (1930)

Periods of population growth: pre-1790–1970; 1990–2020

Subdivisions: Myriad cities; nine CDPs

Pre-1940 residences (estimated): 51,707 (15.1%)
Pre-1940 housing survival rate: 42%
Pre-1860 housing survival rate (1940): 19.2%

Farm housing in disrepair (1950): 9.1%

Nonfarm housing in disrepair (1950): 8.2%
Average farmhouse value (1930): $2,899
Average outbuilding value (1930): $1,274
Average farmhouse size (1940): 5.1 rooms
Number of farms (1920): 2,826
Average farm size (1920): 48.1 acres
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Louisville

Namesake: King Louis XVI of France

Founding: 1778 (platting); 1795 (post office); 1800 (incorporation)

Population (2020): 633,045

Population (historic): 200 (1790); 10,341 (1830); 68,033 (1860); 161,129 (1890); 307,745 (1930)

Periods of population growth: pre-1790–1960; 2000–2020
Pre-1940 residences (estimated): 39,805 (32.9%)
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