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: Pennsylvan...