During the 1930s Depression, Home Owners' Loan Corporation (HOLC) federal agency worked with local banks to assign mortgage lending risk ratings to neighborhoods, from the best (A, colored green) to the worst (D, colored red). HOLC measured not only physical conditions, but also the "social status of the population," and downgraded neighborhoods with Black, immigrant, and lower-income residents. In later decades, activists labeled these discriminatory lending practices as "redlining." See the original maps (Hartford-West Hartford and East Hartford), the full appraisal report (PDF), and summary data (CSV) and other formats. Map developed by Ilya Ilyankou and Jack Dougherty, based on an earlier version created with UConn MAGIC and the Kirwin Institute. View sources and code on GitHub. Learn more at OnTheLine.trincoll.edu.