The 44th Bank of America Chicago Marathon, the city’s biggest racing event of the year, steps off in a matter of days, set to take thousands of runners on a grand tour of the city.

Often, these maps mainly tell us where people live rather than actually showing a geographic trend other than population density. A map of Chevy Volt ownership, left, and a map of population density.

In the first map shown below, Chicago--and the rest of Cook County--is one of only four counties in a large swath of the Midwest that do not have a majority white population. The data comes from U ...

A reader wondered how Chicago’s coastline has changed over the decades. We look at the earliest maps of Chicago to get us closer to an answer.

Not many people outside of Chicago know that the city doesn't actually have an officially sanctioned list of neighborhoods like, say, New York. Instead, the city has 77 community areas—which ...