Area Code — 331

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Rate centers: BARTLETT, AURORA, YORKVILLE, NAPERVILLE, ELMHURST, ST CHARLES, SUGARGROVE, GENEVA, ROSELLE, LOMBARD, W CHICAGO, DOWNERSGRV, OSWEGO, WARRENVL

Companies: T-MOBILE USA, INC., SPRINT SPECTRUM L.P., LEVEL 3 COMMUNICATIONS, LLC, CELLCO PARTNERSHIP DBA VERIZON WIRELESS, NEW CINGULAR WIRELESS PCS, LLC, AMERITECH ILLINOIS, DENALI SPECTRUM LICENSE, LLC, BANDWIDTH.COM CLEC, LLC, PEERLESS NETWORK OF ILLINOIS, LLC, COMCAST PHONE OF ILLINOIS, LLC DBA COMCO, NEXTEL COMMUNICATIONS, INC., MCI WORLDCOM COMMUNICATIONS, INC., YMAX COMMUNICATIONS CORP., GLOBAL CROSSING LOCAL SERVICES, INC., BROADWING COMMUNICATIONS, LLC, US XCHANGE OF ILLINOIS LLC DBA CHOICE ONE COMM IL, CYGNUS TELECOMMUNICATIONS CORPORATION, CBEYOND COMMUNICATIONS, LLC, GLOBALCOM, INC., ALLEGIANCE TELECOM, INC., CIMCO COMMUNICATIONS, INC., XO ILLINOIS, INC., PAETEC COMMUNICATIONS, INC., ACCESS ONE, INC., SIGECOM, LLC, OVATION COMMUNICATIONS OF ILLINOIS, INC., DIGITAL NETWORK ACCESS COMMUNICATIONS, INC.

List of 331 Area-Code Phone Number Prefixes

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