Jo Daviess County, Illinois

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 / 42.36°N 90.21°W / 42.36; -90.21
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
 (2020)
 • Total22,035
 • Estimate 
(2023)
21,756 Decrease
 • Density36/sq mi (14/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district16th
Websitewww.jodaviesscountyil.gov

Jo Daviess County (/ˈdvɪs/) is the northwesternmost county in the U.S. state of Illinois. According to the 2020 census, it had a population of 22,035.[1] Its county seat is Galena.[2] Jo Daviess County is part of the Tri-State Area and is located near Dubuque, Iowa and Platteville, Wisconsin. As part of the Driftless Area, Jo Daviess County contains rugged terrain compared to the rest of the state. Within Jo Daviess County lies Charles Mound, the highest natural point in Illinois, as well as eight of the ten highest points in Illinois.[3][4]

  1. ^ "Jo Daviess County, Illinois". United States Census Bureau. Retrieved June 9, 2023.
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 3, 2015. Retrieved June 7, 2011.
  3. ^ Peak Visor: Jo Daviess County Illinois.
  4. ^ Peak Visor: Illinois.