This page contains Chicago Police Department Investigatory Stop Report (ISR) data. The files have had all personally identifying information removed. Juvenile records have been redacted.

This link contains data from 01 JAN 2016 through 16 JAN 2018. The file contains the a data dictionary as well:
Click here to download ISR Data 2016-2017

This is an updated data dictionary for the data provided below for 2018 and 2019.
ISR Data Dictionary

This link contains data for 2018 and 2019.
ISR Data 2018-2019