There are 31 Social Services Departments in Illinois, serving a population of 12,854,526 people in an area of 55,505 square miles. There is 1 Social Services Department per 414,662 people, and 1 Social Services Department per 1,790 square miles.
The state of Illinois is ranked 37th in Social Services Departments per capita, and 20th in Social Services Departments per square mile.