312 Area Code
The 312 area code serves Chicago in United States. Learn the cities and counties covered, the time zone, dialing format, and how to get a local 312 business number.
Cities & regions in the 312 area code (1)
Frequently asked questions
What area code is 312?+
312 is a North American Numbering Plan (NANP) area code in United States, primarily covering Chicago.
Where is the 312 area code located?+
The 312 area code is located in United States. It operates on Central Time (CT).
How do you dial the 312 area code from abroad?+
Dial your country's international exit code, then +1 312 followed by the 7-digit local number. From inside the US/Canada, dial 1 312 XXX-XXXX.
Can I get a 312 phone number for my business?+
Yes. AstraQom provisions local 312 DID numbers for SIP trunking, hosted PBX, contact centers and toll-free porting — usually within minutes, with no long-term contract.
Get a local 312 number for your business
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AstraQom is an independent global telecom carrier serving 117 countries. We provision local 312 DID numbers, SIP trunks, hosted PBX, contact-center routing and SD-WAN — all on Tier-1 carrier infrastructure with no grey termination and 24/7 multilingual support.