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What area code is 312? The area code 312 is located in Illinois and it serves Chicago. The area code 312 was created on January 1, 1947, and was first put to use on January 1, 1947. It has an overlay with area code 872

The top county that is being served by this area code include Cook County

The major cities under the county that is being served by the area code are listed below:

Cook County

The cities within Cook County that are served by this area code include Chicago.

 

312 Area Code Time Zone

What time zone is 312 Area Code? The time zone in the Chicago area code is the Central Time Zone which is abbreviated as CST. The Central Time Zone is also known as America/Chicago. The Central Standard Time is UTC/GMT -6:00.

 

Significance of 312 Area Code

I don’t know if you notice that there is a three-digit number that precedes a telephone number any time you receive a call from your cell phone. Any time you see the three-digit code 312, it suggests that the call comes from any of the cities or counties listed above. However, there may be an exemption to this. With the use of mobile phone or roaming phone feature, the caller may not necessarily be at any of these cities or counties at the time of calling.

Nevertheless, knowing the counties and cities that the 312 area code covers can guide you when to call a particular person. This is because the person you want to call may be in a time zone that is different from your own.

 

Telephone Carriers in 312 Area Code

If you want to get a wireless telephone within the 312 area code, the popular wireless telephone carriers that you can approach include Verizon Wireless, Sprint, Cingular Wireless, USA Mobility Wireless, T-mobile, Ameritech, Cricket Comms, 365 Wireless, and American Messaging (am).

For landline, popular telephone carriers are Ameritech, Broadwing Comms, Mcimetro Access Transmission Services, Allegiance Telecom, Ovation Comms, Teleport America, RCN Telecom Services, First Comms, United States Cellular Corp., Bandwidth.com, AT&T Local, Access One, Global Crossing Local Services, Xo Illinois, Sigecom, Net Talk.com, Level 3 Comms, Neutral tandem, Mci Worldcom Comms, Choice One Comm II, Ymax Comms Corp., PG Telecom, Cimco Comms, Peerless Network, Broadvox-clec, Centurylink Comms, Rclec, Indiana Paging Network, Tw Telecom, Citrix Comms, Comco,

 Zip Codes in 312 Area Code

City	County	State	Area Code	Zip Code
Chicago	Cook	Illinois	312	60605
Chicago	Cook	Illinois	312	60607
Chicago	Cook	Illinois	312	60601
Chicago	Cook	Illinois	312	60603
Chicago	Cook	Illinois	312	60604
Chicago	Cook	Illinois	312	60606
Chicago	Cook	Illinois	312	60610
Chicago	Cook	Illinois	312	60611
Chicago	Cook	Illinois	312	60612
Chicago	Cook	Illinois	312	60616
Chicago	Cook	Illinois	312	60654
Chicago	Cook	Illinois	312	60661
Chicago	Cook	Illinois	312	60642
Chicago	Cook	Illinois	312	60602
Chicago	Cook	Illinois	312	60678
Chicago	Cook	Illinois	312	60694
Chicago	Cook	Illinois	312	60687
Chicago	Cook	Illinois	312	60677
Chicago	Cook	Illinois	312	60669
Chicago	Cook	Illinois	312	60699
Chicago	Cook	Illinois	312	60674
Chicago	Cook	Illinois	312	60684
Chicago	Cook	Illinois	312	60670
Chicago	Cook	Illinois	312	60695
Chicago	Cook	Illinois	312	60668
Chicago	Cook	Illinois	312	60696
Chicago	Cook	Illinois	312	60697
Chicago	Cook	Illinois	312	60691
Chicago	Cook	Illinois	312	60685
Chicago	Cook	Illinois	312	60673

 

Chicago	Cook	Illinois	312	60690
Chicago	Cook	Illinois	312	60686
Chicago	Cook	Illinois	312	60664
Chicago	Cook	Illinois	312	60680
Chicago	Cook	Illinois	312	60693
Chicago	Cook	Illinois	312	60681
Chicago	Cook	Illinois	312	60689
Chicago	Cook	Illinois	312	60701
Chicago	Cook	Illinois	312	60682
Chicago	Cook	Illinois	312	60675

Area Code

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