What area code is 312?
Here's everything about it.
Instant lookup for the 312 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
312 at a glance
Summary
Cities & regions served by 312
Chicago (Loop)3 communities on record for 312.
Where 312 sits on the map
Overlay: 872Coverage area
About the 312 region
312 covers Chicago (Loop) in Illinois, including The Loop and Near North Side. The code has been in service since 1947 and is one of the original North American area codes.
As the Chicago (Loop) region grew, 312 ran low on available numbers, so 872 was added as an overlay code over the same geographic area. Both codes are local to each other and 10-digit dialing applies throughout.
1989: split to create 708; 1996: split to create 773; 2009: overlaid by 872.
Who called me from 312?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 312 does not prove the caller is really in the 312 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 312 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 312 number below.
Frequently asked questions
FAQWhat area code is 312?+–
312 covers central Chicago including the Loop, one of the original 1947 area codes.
Where is area code 312 located?+–
It covers Cook, including The Loop and Near North Side in Illinois.
What cities are in area code 312?+–
Major communities on record include The Loop and Near North Side. The code's territory spans the Chicago (Loop) region of Illinois.
What time zone is 312?+–
312 observes Central (CT), which is UTC−6 / −5 DST and follows daylight saving time.
When did area code 312 start?+–
312 entered service in 1947 as one of the original 1947 North American area codes. Its history: 1989: split to create 708; 1996: split to create 773; 2009: overlaid by 872.
Why do calls to 312 require 10-digit dialing?+–
312 shares its territory with overlay code 872. Because both codes serve the same geographic area, the phone network needs all 10 digits to route a call, and calls between the codes are still local.
Is 312 a scam area code?+–
Scam and robocall traffic can use any North American code, 312 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 312 number, and report anything suspicious.
Can I get a 312 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 312 number regardless of where you physically live.