Question 1

Where is area code 312?

Accepted Answer

Area code 312 covers Chicago and nearby cities including West Chicago in Illinois, in the Central Time.

Question 2

What cities use area code 312?

Accepted Answer

Area code 312 serves Chicago, West Chicago in Illinois.

Question 3

What time zone is area code 312 in?

Accepted Answer

Area code 312 is in the Central Time (America/Chicago).

Question 4

How do you dial a 312 number?

Accepted Answer

Dial all 10 digits: 312 followed by the 7-digit local number. From abroad, dial +1 312 and the local number.

Question 5

Is a call from area code 312 a scam?

Accepted Answer

A 312 number is geographically tied to Illinois, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.

Question 6

Is 312 a country code?

Accepted Answer

No. 312 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 312 number written for international dialing looks like +1 312 followed by the 7-digit local number.

Area Code 312

Cities in area code 312

Area codes by city

Carriers in area code 312

Other Illinois area codes

Nearby area codes