Meadowhawk dragonflies are found in a number of places in Chicago. You can read more about them at UW Milwaukie's Field Station website; they were actually a featured "bug of the week" there.
Also, here's a video taken of one at the West Chicago Prairie Nature Preserve:
(1) Andersonville (8/1/14)
(Creative Commons Attribution Share-Alike license)
I found a meadowhawk dragonfly in the Andersonville neighborhood of Chicago.