The Census data about boundaries of regions in years 1990, 2000, 2010, and (yearly) 2013 to 2018 is available here:

Analogous data for (yearly) 2019 to 2022 is available here:

Description of the Data

We only downloaded (so far) one data set from the Census:

which we used in a project together with the Craigslist data set.

Transformations to the original data source