“Welcome to the City of Chicago’s Data Dictionary. This website serves as a single, comprehensive database catalog for the City of Chicago and City of Chicago sister agencies. It is a resource for anyone who is interested in understanding what data is held by City agencies and departments, how and if it may be accessed, and in what formats it may be accessed. We invite you to explore the huge volume of data maintained by the City of Chicago.”

• See also Chicago City Initiative 14 Increase and improve City data: “The City will continue to increase and improve the quality of City data available internally and externally, and facilitate methods for analyzing that data to help create a smarter and more efficient city.”