Madison County, Ohio

Founding: 1810
Parent county: Franklin

Namesake: James Madison, U.S. president
Seat: London (1810–)

Land area: 466 square miles

Population (2020): 43,824

Population (historic): 1,603 (1810); 9,025 (1840); 15,633 (1870); 20,590 (1900); 20,253 (1930)

Periods of population growth: pre-1810–1880; 1890s; 1920–2020

Subdivisions: One city; five villages; three CDPs; 14 townships

Pre-1940 residences (estimated): 3,096 (19.5%)
Pre-1940 housing survival rate: 60.2%
Pre-1860 housing survival rate (1940): 20.9%

Farm housing in disrepair (1950): 7.6%

Nonfarm housing in disrepair (1950): 9.8%

Average farmhouse value (1930): $1,711
Average outbuilding value (1930): $1,561
Average farmhouse size (1940): 6.1 rooms
Number of farms (1920): 1,769
Average farm size (1920): 147.6 acres
Sources of settlement: Virginia, Ireland, Maryland, Pennsylvania, and Vermont
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London

Namesake: London, England

Founding: 1810 (platting); 1813 (post office); 1831 (incorporation)

Population (2020): 10,279

Population (historic): 132 (1820); 1,152 (1860); 3,067 (1880); 3,511 (1900); 4,141 (1930)

Periods of population growth: 1810–2020
Pre-1940 residences (estimated): 1,144 (24.7%)
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