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Jo Daviess County is a county located in the northwest corner of U.S. state of Illinois . According to the 2010 census , it has a population of 22,678, which is an increase of 1.7% from 22,289 in 2000. Its county seat is Galena . As part of the Driftless Area , Jo Daviess County is known for its extraordinarily scenic stretches of road and valley views. Within Jo Daviess County lies Charles Mound , the highest natural point in Illinois. Jo Daviess County is part of the Tri-State Area and the Dubuque , Iowa , Galena , Illinois , Platteville , Wisconsin , metropolitan area. Jo Daviess County's population holds 13-15% of the area's population.
Jo Daviess County was formed in 1827 out of Henry and Putnam Counties . It is named for Maj. Joseph Hamilton Daveiss , United States District Attorney for Kentucky , who was killed in 1811 at the Battle of Tippecanoe . Maj. Daveiss' name is universally misspelled, as in the name of this and other counties. The local pronunciation is "Davis". A proposed wind farm would be located near the town of Nora in the northeastern corner of the county. County border changes 1830- The northern border of Illinois and Wisconsin was formally established. Until that time, several Wisconsin towns actually were under the jurisdiction of Jo Daviess County. 1831- Rock Island County was formed from a part of the county, along with a new northern extension of Henry County and Putnam County.