Chicago is a location in Watch Dogs.
Chicago is the principle location of Watch Dogs. It is the largest city in the state of Illinois, and the third largest city in the United States. Ubisoft has stated that the in-game version of Chicago will be large enough to support vehicles that can travel in excess of 180mph. All the trailers thus far have taken place in Chicago, with the E3 Gameplay Video prominently featuring the Chicago River, the Ambrose Theater, and The Loop.
Chicago is linked by a massive public transport system run by the Chicago Transit Authority consisting of buses and trains, which in cooperation with the various Taxi cabs throughout the city, provide the most effective and rapid transport in the entire city. The city also houses two airports, though it is unclear whether or not they will be featured in the game.
The Chicago River prominently runs through the city, connecting many of its docks and inlets.
Chicago is, quite clearly, based on the real life city of Chicago. Given the alternative history in which CtOS is in control of everything, the city is relatively well replicated, though keen-eyed Chicagoans can point out the various inconsistencies within the city itself.