The area code 224 is located in northeastern Illinois and covers cities such as Elgin, Waukegan, Arlington Heights, Evanston, and Schaumburg. It is an overlay for area code 847, which means that both area codes cover the same geographic area. The area code was assigned on May 1st, 1998, and went into service on January 5th, 2002. If you receive a call from a number with a 224 area code, it is likely coming from one of the cities within the area codes coverage area.