Area Code 312 Information

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About Area Code 312

The 312 Area Code (or Area Code 312) is located in the state of MO. Area Code 312 is one of the 269 3-digit telephone area codes in the USA. It covers roughly 1.63 million unique phone numbers and 5.08 million individuals near the city of Saint Louis

The phone number in the 312 area code can be found in the following cities or locations.

Chicago, Hinsdale, La Grange Park, Northbrook, Roselle, Wheeling.

The carriers providing phone numbers in this area code are: 365 Wireless, AT&T Local, Access One, Allegiance Telecom, American Messaging (am), Ameritech Illinois, Clec, Broadvox-clec, Broadwing Communications, Cbeyond Communications, Cellco Partnership DBA Verizon Wireless, Centurylink Communications LLC, Cimco Communications, Citrix Communications LLC, Comcast Phone Of Illinois DBA Comco, Cricket Communications, First Communications LLC, Global Crossing Local Services-il, Indiana Paging Ntwk, Level 3 Communications, Mci Worldcom Communications, Mcimetro Access Transmission Services LLC, Metro PCS, Net, Neutral Tandem-illinois, New Cingular Wireless PCS, Ovation Communications Of Illinois, Paetec Communications, Peerless Network Of Illinois, Pg Telecom Of Illinois Inc., Rclec, Rcn Telecom Services Of Illinois, Sigecom, Sprint Spectrum L.p., T-mobile Usa, Teleport Communications America, Tw Telecom Of Illinois LLC, United States Cellular Corp. - Illinois, Us Xchange Of Illinois LLC DBA Choice One Com, Usa Mobility Wireless, Xo Illinois, Ymax Communications Corp..

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Area Code: 312

State: Illinois - IL