|Jo Daviess County Illinois Cities/Towns - Apple River, Council Hill, East Dubuque, Elizabeth, Galena (County Seat), Guilford, Hanover, Menominee, Nora, Pleasant Valley, Scales Mound, Stockton, Warren, Woodbine
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Jo Daviess County is a county located in the U.S. state of Illinois. As of 2016, the population was 21,770. Its county seat is Galena.
Jo Daviess County was formed in 1827. 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."