DuPage County, Illinois
Founding: 1839 Parent county: Cook Namesake: The DuPage River Seat: Naperville (1839–1867); Wheaton (1867–) Land area: 327 square miles Population (2020): 932,877 Population (historic): 3,535 (1840); 14,701 (1860); 19,161 (1880); 28,196 (1900); 91,998 (1930) Periods of population growth: pre-1840–2020 Subdivisions: Seven cities; 20 villages; nine townships Pre-1940 residences (estimated): 19,432 (5.4%) Pre-1940 housing survival rate: 76.3% Pre-1860 housing survival rate (1940): 19.8% Farm housing in disrepair (1950): 4.8% Nonfarm housing in disrepair (1950): 2% Average farmhouse value (1930): $3,520 Average outbuilding value (1930): $3,537 Average farmhouse size (1940): 6.8 rooms Number of farms (1920): 1,756 Average farm size (1920): 88.6 acres Sources of settlement: Germany, New York, Pennsylvania, and England _______________________________...