The City of Chicago and the State of Illinois have released hundreds of public datasets online where visitors can view, search and even download the datasets for closer inspection. 

The City of Chicago data portal features more than 250 datasets including crime incidents, employee salaries, city contracts awarded, and logs of Freedom of Information Act requests. 

The State of Illinois data portal features more than 50 datasets including lottery sales by ZIP code, median wages by occupation, incidents of leaking underground storage tanks and reports on individual income tax returns by ZIP code.