Greene County, Iowa

Founding: 1854 (declared in 1851)
Parent county: Unorganized territory

Namesake: Nathanael Greene, Continental Army general
Seat: Jefferson (1856–)

Land area: 570 square miles

Population (2020): 8,771

Population (historic): 1,374 (1860); 12,727 (1880); 17,820 (1900); 16,528 (1930)

Periods of population growth: pre-1860–1900; 1910–1940; 1990s

Subdivisions: Eight cities; 16 townships

National Register listings: 17

Pre-1940 residences (estimated): 1,810 (39.8%)
Pre-1940 housing survival rate: 44.6%

Farm housing in disrepair (1950): 3.9%

Nonfarm housing in disrepair (1950): 3.5%

Average farmhouse value (1930): $2,162
Average outbuilding value (1930): $2,732
Average farmhouse size (1940): 6.6 rooms
Number of farms (1920): 2,059
Average farm size (1920): 148.5 acres
Sources of settlement: Illinois, Ohio, New York, Pennsylvania, and Indiana
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Jefferson

Namesake: Thomas Jefferson, U.S. president

Founding: 1854 (platting as New Jefferson); 1857 (post office); 1872 (incorporation)

Population (2020): 4,182

Population (historic): 779 (1870); 1,875 (1890); 2,477 (1910); 3,431 (1930)

Periods of population growth: 1854–1900; 1910–1980; 1990s
Pre-1940 residences (estimated): 569 (26.4%)
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Outstanding Buildings

1. *St. Patrick Catholic Church (1915). 449 E Road. Cedar. Romanesque.