This is the place to look for important information about how to use this dataset, so please expand this box and read on!

This is the source data for some of the metrics available at https://www.chicago.gov/city/en/sites/covid-19/home/latest-data.html.

For all datasets related to COVID-19, see https://data.cityofchicago.org/browse?limitTo=datasets&sortBy=alpha&tags=covid-19.

This dataset contains counts of people tested for COVID-19 and their results.

Only Chicago residents are included based on the home address as provided by the medical provider.

Only polymerase chain reaction (PCR)-based tests are included, and only one test is counted for each individual. Tests are counted on the day the specimen was collected. Twenty-four tests collected prior to 3/1/2020 are not included in the table.

Positive lab results are confirmed for COVID-19. Not-positive lab results include negative results, invalid results, and tests not performed due to improper collection. Chicago Department of Public Health (CDPH) does not receive all not-positive results.

Demographic data are more complete for those who test positive; care should be taken when calculating percentage positivity among demographic groups.

All data are provisional and subject to change. Information is updated as additional details are received.

Data Source: Illinois National Electronic Disease Surveillance System

Map of locations offering COVID-19 testing in Chicago.

For more information on COVID-19 testing, see https://www.chicago.gov/city/en/sites/covid-19/home/managing-your-health.html?#tab-shouldtest.

Locations offering COVID-19 testing in Chicago.

For a map of these locations, see https://data.cityofchicago.org/d/j2wj-wjrp.

For more information on COVID-19 testing, see https://www.chicago.gov/city/en/sites/covid-19/home/managing-your-health.html?#tab-shouldtest.

For all datasets related to COVID-19, see https://data.cityofchicago.org/browse?limitTo=datasets&sortBy=alpha&tags=covid-19.

Does not include tests with unknown date.

Note that because of delayed reporting, counts from recent dates are likely to be preliminary and to increase as the Department of Public Health gets additional reports.