Find any 773- phone number in Illinois

The 773 area code is the area code for the city of Chicago in Illinois. It was implemented in 1996 as an overlay of the 312 and 708 area codes. It covers a certain geographical area, including the ethnic and cultural diversity of the Chicago metropolitan region. The area code also includes northwestern Indiana, the city of Gary, and some of its suburbs.

The 773 area code is part of the North American Numbering Plan, which is a telephone numbering plan used in the United States, Canada, and some of the Caribbean Islands. The system divides the areas into geographically relevant region codes that can then be assigned a number. Numbers are then assigned sequentially to companies, organizations, and individuals as needed. The 773 area code is one of over 300 area codes that are part of the system.