Since data is taken from the U.S. census, the map includes a dot for every single person at the place they lived on April 1, 2010—even President Barack Obama.

The Racial Dot Map represents every person–all 308,745,538 of us–in the United States. Here, the dense population masses of New York and New Jersey.

Yale prof Bill Rankin uses dot maps to show the diversity and lack thereof in Chicago and the Bay Area. Chicago is as segregated as you'd expect, but the far north side along the lake looks to be ...