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Measles cases are on the rise globally and here in Illinois the number is increasing as well. Vaccines are 97% effective in preventing this highly contagious disease.  To learn more about this infection and get information on vaccination, go to  Learn how to identify measles and the safe and effective vaccine that can prevent this potentially life-threatening infection for adults and children. 

Illinois Population Data

Total Population of Illinois, Chicago, and Illinois Counties: 1950-2020

State/City/County 1950 1960 1970 1980 1990 2000 2010 2020

Source: U. S. Department of Commerce, Census 2020 Redistricting Data (Public Law 94-171)