Chicago

Chicago, officially the City of Chicago, is the most populous city in the U.S. state of Illinois, and the third most populous city in the United States, following New York City and Los Angeles.

Geography
Chicago is located in northern Illinois, United States, at the south western tip of Lake Michigan. It sits on the Saint Lawrence Seaway continental divide at the site of the Chicago Portage, an ancient trade route connecting the Mississippi River and the Great Lakes watersheds. The city of Chicago itself sits on the Chicago Plain, a flat plain that was once the bottom of ancestral Lake Chicago.

Communities and Neighborhoods
Major sections of the city include the central business district, called The Loop, and the North, South, and West Sides. The North Side is the most-densely-populated residential section of the city, and many high-rises are located on this side of the city along the lakefront. The South Side is the largest section of the city, encompassing roughly 60% of the city's land area andcontains most of the facilities of the Port of Chicago. There are said to be more than 200 neighborhoods in Chicago although residents differ on their names and boundaries.

Surrender, Book 1
Chicago is the primary setting for Surrender where Your Character (Surrender) begins to explore the world of BDSM.

LoveHacks, Book 2
In Chapter 11, it is revealed that Isaac Collins used to work in Chicago.

Open Heart, Book 1
In Chapter 9, Elijah Greene reveals that he went to the University of Chicago.

Laws of Attraction, Book 1
In a premium scene of Chapter 10, Marcus Sharpe reveals he comes from a suburb outside Chicago.