312 Area Code is a phone number code used in the state of Illinois, USA. It covers the entire of Chicago.
The areas that use this area code follow Central Time Zone (CT), and the time right now is . #Daylight Saving from 12 March, 2023 to 05 November, 2023
Area code 309 has been in use since January 1, 1957.
| Area Code: | 312 |
|---|---|
| State: | Illinois, USA |
| City: | Chicago |
| County: | Cook |
| Time Zone: | Central Time (CT) |
| Current Time: |
Phone Number Owner Details Lookup
312 Area Code Location Map
312 Area Code City List
| County | City |
|---|---|
| Cook | Chicago |
FAQs
Where is area code 312?
Area code 312 is used in Illinois, USA. It covers entire city of Chicago.
What area codes are in Chicago?
Peoria, Illinois has two area codes, 309 and 861.
What is the time zone of 312 area code?
The 312 area code is located in the Central Time Zone (CT) in the United States.
History of 312 Area Code
The 312 area code was created in 1947. At the time, it served the entire state of Illinois.
In 1989, the northern suburbs were assigned the 847 area code, and in 1996, the western suburbs were assigned the 630 area code.
In 1996, the 312 area code was further split, and the area code 773 was created to serve Chicago’s northern and western neighborhoods. The 312 area code was reduced to cover just the downtown area of the city, including the Loop, River North, and the Near North Side.
Today, the 312 area code is one of four area codes used in the Chicago metropolitan area, along with 773, 872, and 708.