Greene County, Illinois

Founding: 1821
Parent county: Madison

Namesake: Nathanael Greene, Continental Army general
Seat: Carrollton (1821–)

Land area: 543 square miles

Population (2020): 11,985

Population (historic): 7,674 (1830); 16,093 (1860); 23,010 (1880); 23,402 (1900); 20,417 (1930)

Periods of population growth: pre-1830–1890; 1910s

Subdivisions: Four cities; five villages; 13 townships

Pre-1940 residences (estimated): 2,725 (42.6%)
Pre-1940 housing survival rate: 49.6%
Pre-1860 housing survival rate (1940): 11%

Farm housing in disrepair (1950): 7.8%

Nonfarm housing in disrepair (1950): 7.9%

Average farmhouse value (1930): $1,455
Average outbuilding value (1930): $1,224

Average farmhouse size (1940): 5.7 rooms
Number of farms (1920): 2,143
Average farm size (1920): 120.6 acres
Sources of settlement: Kentucky, Missouri, Tennessee, Ohio, Ireland, and Germany
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Carrollton

Namesake: Charles Carroll, Maryland politician

Founding: 1821 (platting); 1822 (post office); 1861 (incorporation)

Population (2020): 2,485

Population (historic): 1,934 (1880); 2,355 (1900); 2,075 (1930)

Periods of population growth: pre-1880–1900; 1920–1970; 1990s
Pre-1940 residences (estimated): 522 (44%)
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