Justin Paget/DigitalVision via Getty Images Ameren Corporation (NYSE:AEE) is a large electric and natural gas utility that operates in the U.S. states of Illinois and Missouri:   Ameren Corporation As we can see from the map above, the company’s service territory includes the St. Louis, Missouri metropolitan area as well as most of the state of Illinois. However, Chicago, Illinois is notably excluded from this service territory and is not served by this company. This service area is a mixture of urban,  ...