Yep [1]! It's pretty damn impressive, but it's by no means a complete list of the data Chicago stores. Which is where FOIA comes into the picture. According to

Yep [1]! It's pretty damn impressive, but it's by no means a complete list of the data Chicago stores. Which is where FOIA comes into the picture. According to Chicago's (ex) Chief Data Officer, they also have a fairly routine process of scraping through Chicago's FOIA requests for gauging interest for new datasets. In other (somewhat naive) words - the more data-like FOIA requests that Chicago receives, the more open data will be made available. On a similar note, federal FOIA has some built-in "proactive disclosure" language that makes information publicly available after it's been requested more than three times, or is likely to be requested often or with interest. Not an expert on this piece by any means, but it's something to consider when thinking about open data portals and the like. Also, check out Data USA's (exceptionally bloated) data portal [2], which includes a lot of data throughout portals throughout the US. [1] https://data.cityofchicago.org https://data.cityofchicago.org [2] https://datausa.io/ https://datausa.io/