Area Code 312 at a Glance
| Area code | 312 |
| Region | Chicago, IL |
| Country | United States |
| Primary timezone | America/Chicago |
| Dialing format | +1 (312) NXX-XXXX |
Frequently Asked Questions
Where is area code 312?
Area code 312 serves Chicago, IL, United States.
Who is calling me from area code 312?
A call from area code 312 most likely originates from Chicago, IL, but caller ID can be spoofed. If an unknown caller asks for personal or payment information, hang up and call the organization back on its official number.
How do I dial a 312 number?
Within North America: dial 1-312 followed by the 7-digit number. From abroad: your international prefix (like 00 or +), then 1 312 and the number.