Geographic Regions and Area Codes

Area code 872 primarily covers Cook County, with its principal city being Chicago. This area code also includes other cities such as Oak Park, Elmwood Park, Riverdale, and Harwood Heights. The 872 area code is an overlay code for the existing 312 and 773 area codes within Chicago. Nearby area codes include 219 (Hammond, IN), 224/847 (Elgin, IL), 331/630 (Aurora, IL), 708 (Cicero, IL), and 779/815 (Rockford, IL).

Chicago, the principal city in the 872 area code, is a major hub for business and commerce. The city's diverse economy includes sectors such as finance, technology, manufacturing, and healthcare. The presence of multiple area codes in Chicago reflects the high demand for phone numbers in this densely populated and economically vibrant region.