Under Governor Pat Quinn, Illinois passed the Open Operating Standards Act (Public Act 98-627) which established policy for the state government’s open data portal. Effective in 2014, the act states: “Public data sets that are made available on the Internet by agencies shall be accessible through a single web portal that is linked to data.illinois.gov or any successor website.” Illinois thereby formally prioritized open data as a state policy. The main web portal, data.illinois.gov, was established to make accessible state government agencies’ numerous datasets in a single location. Several other states in the country have also initiated open-data efforts in recent years. The importance of open data and reproducible research has been described in past IGPA reports but this report focuses on Illinois specifically: What is the current state of Illinois’ open data portal? How does Illinois compare to other states? What can be done to improve the data portal?