Geographic Overview of Area Code 312

Area code 312 is primarily located in the state of Illinois, specifically covering parts of Chicago, including downtown, the Chicago Loop, and its immediate environs. It is one of the smallest area codes in the nation, encompassing only a few square miles. The area is roughly bounded by North Avenue on the north, Western Avenue on the west, and 35th Street on the south, with Lake Michigan to the east. Major cities covered by Area Code 312 include Chicago, Cicero, and Schaumburg. This compact yet densely populated area is a bustling hub of economic activity and cultural significance.

Nearby area codes include: