A young man accidentally discovered that 31 of Wisconsin’s 56 Black neighbors are actually correctional facilities according to City Lab reports:

17-year-old Lew Blank was fiddling around with the Weldon Cooper Center’s Racial Dot Map when he discovered something disturbing about Wisconsin, where he lives: More than half of the African-American neighborhoods in the state are actually jails. Not only that, but the rest of the black neighborhoods across the state are either apartment complexes, Section 8 housing, or homeless shelters—the lone exception being a working-middle class section of Milwaukee.

Sharing this info on the Young, Gifted, and Black Coalition’s blog, Blank explains that he used the Racial Dot Map to identify where predominantly black neighborhoods—defined as “a certain area where the majority of residents are African Americans”—are located throughout the state. There are 56 of them, 31 of which are either jails or prisons. There are 15 cities where the only black neighborhood is a jail. The city of Winnebago claims it has an African-American population of more than 19 percent, but most, if not all, of that black population is located among one of four correctional facilities there. It’s perhaps no wonder that Wisconsin perennially comes up as the worst place for African Americans to live in the country.

Three of the seven “black neighborhoods” in Racine are actually correctional facilities: The section circled by “B” contains two jails.

These disparities are not without consequence. Cities and legislative districts with mostly white populations are able to draw down extra federal resources based on their incarcerated minority populations through a sketchy practice called “prison gerrymandering.”