Analysis: How the Black Butterfly grew, changed over the last 80 years

If you read The Banner’s data work, you know the Black Butterfly — the majority Black area of Baltimore. You may not know, though, that it’s gotten smaller. The landmass known as the Black Butterfly shrunk, just slightly, for the first time in 2020, while becoming more prominent in Baltimore County. We’ve written a fair bit about the Black Butterfly here at The Banner. It’s appeared repeatedly in our data stories, and we recently published a roundup of different datasets where we’ve found it.