815 Area Code: Cities, Time Zone and Zip Codes
What area code is 815? The area code 815 is located in Illinois and it serves Rockford, Joliet, DeKalb, Crystal Lake, Romeoville, Plainfield, Kankakee, McHenry, Freeport, Belvidere, and some other surrounding cites. The area code 815 was created on January 1, 1947, and was first put to use on January 1, 1947. It serves as