Illinois is a midwestern state and the fifth most populous state in the US. The largest city in this state is Chicago and hence, it also has the maximum number of Extra Space Storage facilities. Chicago has 11 Extra Space self storage facilities, Naperville has two of these, while Lincolnshire has just one. There are Extra Space storage facilities located in Crest Hill, Deerfield, Highland Park, Joliet and many more. Each of the above mentioned cities has one Extra Space Storage.