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Area Code — 312

Phone numbers in area code 312 cover these cities in IL:

Chicago, Chestnut Street, Fort Dearborn, Ontario Street, Nancy B Jefferson, Twenty Second Street, Merchandise Mart, State Of Il, Commonwealth Edison, Div Of Postal Inspectors, Chase Bank, Jp Morgan Chase, Bank Of America, Northern Trust Co, Pnc Bank, American National Bank, Sears Tower, Cna Center, National City Bank, Peoples Gas And Light, Jt Weeker Isc, Harris Bank, Fleet, Usps District Chicago

The 312 area code covers these zip codes in IL:

60602, 60603, 60604, 60605, 60606, 60607, 60610, 60611, 60612, 60616, 60642, 60654, 60661, 60664, 60668, 60669, 60670, 60674, 60675, 60677, 60678, 60681, 60684, 60685, 60686, 60687, 60688, 60690, 60691, 60693, 60694, 60696, 60697, 60699

Rate centers:

CHICGOZN01 , NORTHBROOK , WHEELING , ROSELLE , CHICGOZN07 , LA GRANGE , HINSDALE , CHICGOZN04

Companies:

AMERITECH ILLINOIS , CELLCO PARTNERSHIP DBA VERIZON WIRELESS , NEW CINGULAR WIRELESS PCS, LLC , XO ILLINOIS, INC. , ALLEGIANCE TELECOM, INC. , LEVEL 3 COMMUNICATIONS, LLC , SIGECOM, LLC , UNITED STATES CELLULAR CORP.LINOIS , SPRINT SPECTRUM L.P. , BROADWING COMMUNICATIONS, LLC , OVATION COMMUNICATIONS OF ILLINOIS, INC. , PAETEC COMMUNICATIONS, INC. , AMERICAN MESSAGING (AM), INC. , GLOBALCOM, INC. , CIMCO COMMUNICATIONS, INC. , AT&T LOCAL , T-MOBILE USA, INC. , TELEPORT COMMUNICATIONS GROUP - CHICAGO , USA MOBILITY WIRELESS, INC. , DENALI SPECTRUM LICENSE, LLC , MCIMETRO ACCESS TRANSMISSION SERVICES LLC , CBEYOND COMMUNICATIONS, LLC , NEXTEL COMMUNICATIONS, INC. , ACCESS ONE, INC. , COMCAST PHONE OF ILLINOIS, LLC DBA COMCO , BANDWIDTH.COM CLEC, LLC , GLOBAL CROSSING LOCAL SERVICES, INC. , SBC INTERNET SERVICES, INC. , NET TALK.COM, INC. , US XCHANGE OF ILLINOIS LLC DBA CHOICE ONE COMM IL , NEUTRAL TANDEMLINOIS, LLC , MCI WORLDCOM COMMUNICATIONS, INC. , RCN TELECOM SERVICES OF ILLINOIS, INC. , YMAX COMMUNICATIONS CORP. , CYGNUS TELECOMMUNICATIONS CORPORATION , AT&T - LOCAL , HALO WIRELESS, INC , CIBOLO CREEK VENTURES, LLC DBA ROUTEPOINT COMM IL , PG TELECOM OF ILLINOIS INC. , GLOBAL NAPS, INC. , INFOTELECOM, LLC , INDIANA PAGING NTWK , PEERLESS NETWORK OF ILLINOIS, LLC

List of 312 Area-Code Phone Number Prefixes