Jo Daviess County, Illinois

Founding: 1827
Parent counties: Henry, Mercer, and Putnam

Namesake: Joseph Daveiss, Indiana militiaman
Seat: Galena (1827–)

Land area: 601 square miles

Population (2020): 22,035

Population (historic): 2,111 (1830); 18,604 (1850); 27,820 (1870); 24,533 (1900); 20,235 (1930)

Periods of population growth: pre-1830–1870; 1940–1960; 1970s; 1990–2010

Subdivisions: Two cities; eight villages; two CDPs; 23 townships

Pre-1940 residences (estimated): 4,291 (31.3%)
Pre-1940 housing survival rate: 71.7%
Pre-1860 housing survival rate (1940): 14%

Farm housing in disrepair (1950): 6.4%

Nonfarm housing in disrepair (1950): 5.9%

Average farmhouse value (1930): $2,211
Average outbuilding value (1930): $2,785

Average farmhouse size (1940): 7.1 rooms
Number of farms (1920): 2,183
Average farm size (1920): 108.3 acres
Sources of settlement: Ireland, Germany, New York, England, Pennsylvania, and Ohio
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Galena

Namesake: Lead mines near the city

Founding: 1826 (platting); 1826 (post office); 1835 (incorporation)

Population (2020): 3,308

Population (historic): 6,004 (1850); 7,019 (1870); 5,635 (1890); 4,835 (1910); 3,878 (1930)

Periods of population growth: pre-1850–1860; 1930–1950
Pre-1940 residences (estimated): 1,173 (60.3%)
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