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Historical data tracks COVID-19 cases, tests, and deaths for Chicago residents by home ZIP code. Cases are counted based on the week the test specimen was collected, and test counts include multiple tests per person. Data originates from the Illinois National Electronic Disease Surveillance System, Cook County Medical Examiner’s Office, and other public health sources.
Dataset is retired for historical use only. Summing the 'Cases - Weekly' column is unreliable due to privacy suppression for low-count ZIP Codes. Percent Tested Positive calculations may be skewed by factors like repeated employment testing. Available in XML, CSV, RDF, and JSON formats.