312 Area Code
Illinois, USA
Local time now · Central Time
2:44 AM
Area code 312 is in Illinois, USA, serving Chicago, Bridgeport and Willowbrook. It uses Central Time — the time there now is 2:44 AM. 872 is an overlay for the same area, so local calls need 10-digit dialing. In service since 1947.
| Area code | 312 |
|---|---|
| Location | Illinois, USA |
| Major cities | Chicago, Bridgeport, Willowbrook |
| Time zone | Central Time |
| Overlay codes | 872 |
| In service since | 1947 |
Other area codes in Illinois
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Frequently asked questions
Where is area code 312?
Illinois, USA — including Chicago, Bridgeport and Willowbrook.
What time zone is area code 312?
Central Time.
How do I call a 312 number from abroad?
Dial your international access code, then 1 (the country code), then 312 and the 7-digit number — for example +1 312 555 0100. From the UK or India dial 00 1 312 …; from Bangladesh 00 1 312 … .
Is a call from 312 a scam?
Not by itself — 312 is an ordinary geographic area code in Illinois. Numbers can be spoofed, so be careful with unexpected calls asking for money or personal details.
Sources: North American Numbering Plan Administrator (NANPA) NPA database (10/25/2026); major cities from Wikidata (CC0). An area code shows where a number was first assigned — with number portability and mobile phones, the caller may be anywhere.