815 Area Code in Illinois Start With 4
Enter the last 6 digits to find that number inBelvidere, Illinois.
Information for Area Code 815
Country: United States
Cities in Area: Belvidere, Crystal Lake, DeKalb, Freeport, Joliet, Kankakee, Loves Park, Machesney Park, McHenry, Rockford, Romeoville, Woodstock
Where is Area Code 815?
Area code (815) is in the state ofIllinois, and there are12 cities in this area code.