Question for those that are in Chicago

Never heard of it, but sometimes companies says that they are in Chicago but really in the suburbs or outside of downtown. Chicago is a big city so not surprised if never heard of it.
Thanks to everyone that answered! The reason I asked was because I was doing some Googling about Chicago PR Firms & I came across Lannon Communications & I went to their website and they have a very impressive clientele list (Hermes, Burberry, Cartier, Louis Vuitton, MaxMara, Yves Saint Laurent, St. John, Escada, etc.) & I was just curious to see if anyone else had heard of them.