🇺🇸 United States · Illinois

Area code 312

Area code 312 is a telephone area code in Illinois, United States, covering Chicago. Local time is UTC−6 (UTC−5 in summer). Numbers look like (312) 234-5678, or +1 312 234 5678 from abroad.

State: Illinois
Time zone: Chicago UTC−6 (UTC−5 in summer)
Local time now: –
Dial from abroad: +1 312

Places in area code 312

Cities and towns with telephone exchanges in the 312 area code, most exchanges first.

Chicago

How to dial area code 312

Calling from	You dial
Inside the 312 area	312 234 5678 (10 digits)
Elsewhere in the US & Canada	1 312 234 5678
Any mobile phone, anywhere	+1 312 234 5678
UK, Europe, India and most countries	00 1 312 234 5678
Australia	0011 1 312 234 5678

Other area codes in Illinois

217 Springfield, Champaign 224 North Chicago, Schaumburg 309 Peoria, Bloomington 331 Illinois 447 Illinois 464 Illinois 618 Belleville, Granite City 630 Aurora, Naperville 708 Oak Park, Orland Park 730 Illinois 773 Chicago 779 Rockford 815 Rockford, Crystal Lake 847 Schaumburg, Elgin 872 Chicago

Area code 312: FAQ

Where is area code 312?

Area code 312 is in Illinois, United States and serves Chicago.

What time zone is area code 312 in?

Area code 312 is in the America/Chicago time zone (UTC−6 (UTC−5 in summer)).

How do I call a 312 number from outside the US and Canada?

Dial your exit code (00 in most countries, or + on a mobile), then 1, then 312 and the seven-digit number. Example: +1 312 234 5678.

Is a call from area code 312 a scam?

Area code 312 is a regular North American area code, but caller ID can be spoofed: scammers often show local-looking numbers. Do not call back unknown numbers that ask for money or personal data, and check the number with the phone number validator to see whether it is valid and whether it is a mobile, landline or VoIP number.

Phone number API

Check 312 numbers in your app

numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.

Read the documentation

100 free requests every month. No credit card required.

GET https://api.numlookupapi.com/v1/validate/+13122345678

{
  "valid": true,
  "number": "12069220880",
  "local_format": "2069220880",
  "international_format": "+12069220880",
  "country_prefix": "+1",
  "country_code": "US",
  "country_name": "United States of America",
  "location": "Seattle",
  "line_type": "landline",
  "e164_format": "+12069220880",
  "national_format": "(206) 922-0880"
}