About Area Code 312
Area code 312 serves Illinois, covering major cities including Chicago. Operating in the Central Time (CT), this code was established in 1947.
| State | Time Zone | Cities |
|---|---|---|
| Illinois | Central Time (CT) | Chicago |
Active Area Code
312
Illinois
Central Time (CT)
Est. 1947
PRIMARY
Location
Illinois
Chicago
ACTIVE
Coverage
1 Cities
Since 1947
Beware of Spam Calls
Scammers frequently use 312 numbers. Always verify unknown callers before sharing personal information.
Protect Yourself NowCommon Questions
Where is 312?
Located in Illinois, serving Chicago and surrounding areas.
What time zone?
Operates in Central Time (CT).
When established?
Area code 312 was introduced in 1947.
Used for spam?
Can be used by legitimate and fraudulent callers. Always verify unknown numbers.