Jo Daviess County, Illinois

Jo Daviess County is a county in the U.S. state of Illinois. In the 2010 census, 22,678 people lived there. The county seat is Galena.

Jo Daviess County
Hill terrain in the county, part of the Driftless Area
Hill terrain in the county, part of the Driftless Area
Map of Illinois highlighting Jo Daviess County
Location within the U.S. state of Illinois
Map of the United States highlighting Illinois
Illinois's location within the U.S.
Coordinates: 42°22′N 90°13′W
Country United States
State Illinois
Founded1827
Named forJoseph Hamilton Daveiss
SeatGalena
Largest cityGalena
Area
  Total619 sq mi (1,600 km2)
  Land601 sq mi (1,560 km2)
  Water18 sq mi (50 km2)  2.9%
Population
 (2010)
  Total22,691
  Estimate 
(2018)
21,366
  Density37/sq mi (14/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district17th
Websitewww.jodaviess.org
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