Ogle County, Illinois

Founding: 1836
Parent counties: Jo Daviess and unorganized territory

Namesake: Joseph Ogle, Illinois frontiersman
Seat: Oregon (1837–)

Land area: 759 square miles

Population (2020): 51,788

Population (historic): 3,479 (1840); 22,888 (1860); 29,937 (1880); 29,129 (1900); 28,118 (1930)

Periods of population growth: pre-1840–1880; 1890s; 1920–1980; 1990–2010

Subdivisions: Four cities; nine villages; two CDPs; 24 townships

Pre-1940 residences (estimated): 5,944 (26.2%)
Pre-1940 housing survival rate: 67.1%
Pre-1860 housing survival rate (1940): 16.2%

Farm housing in disrepair (1950): 4.5%

Nonfarm housing in disrepair (1950): 4.7%

Average farmhouse value (1930): $2,301
Average outbuilding value (1930): $3,268

Average farmhouse size (1940): 7.5 rooms
Number of farms (1920): 2,784
Average farm size (1920): 137.4 acres
Sources of settlement: Pennsylvania, New York, Maryland, Germany, Ohio, Ireland, and Canada
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Oregon

Namesake: The Oregon Territory

Founding: 1836 (platting); 1837 (post office); 1843 (incorporation)

Population (2020): 3,604

Population (historic): 1,088 (1880); 1,577 (1900); 2,376 (1930)

Periods of population growth: pre-1880–1960; 1970–2000
Pre-1940 residences (estimated): 570 (30.2%)
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