| | Description: | Jo Daviess County, located in northern Illinois, covers an area of 601 square miles and had a 2003 population of 22,526, according to estimates by the U.S. Department of Commerce's Bureau of the Census. Using these figures, Jo Daviess County was the 35th largest county in Illinois geographically, but 54th largest in terms of population. Combining these two measures, Jo Daviess County had the 67th largest population density per square mile among Illinois 102 counties. | |
