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Area Code — 779

Rate centers:

ROCKFORD , GALENA , CRYSTAL LK , SYCAMORE , OGLESBY , JOLIET , WILMINGTON , CRESCENTCY , KANKAKEE , STERLING , FRANKFORT , NEWMILFORD , GENOA , DE KALB , SHEFFIELD , WONDERLAKE , SO BELOIT , MANTENO , MT MORRIS , MARENGO , BELVIDERE , DIXON , NEWARK

Companies:

CELLCO PARTNERSHIP DBA VERIZON WIRELESS , LEVEL 3 COMMUNICATIONS, LLC , NEW CINGULAR WIRELESS PCS, LLC , YMAX COMMUNICATIONS CORP. , SPRINT SPECTRUM L.P. , SBC INTERNET SERVICES, INC. , MEDIACOM TELEPHONY OF ILLINOIS, LLC , BANDWIDTH.COM CLEC, LLC , OVATION COMMUNICATIONS OF ILLINOIS, INC. , INFOTELECOM, LLC , TDS METROCOM INC. , CYGNUS TELECOMMUNICATIONS CORPORATION , TELEPORT COMMUNICATIONS GROUP - CHICAGO , BROADWING COMMUNICATIONS, LLC , US XCHANGE OF ILLINOIS LLC DBA CHOICE ONE COMM IL , IOWA WIRELESS SERVICES, LP , DENALI SPECTRUM LICENSE, LLC , COMCAST PHONE OF ILLINOIS, LLC DBA COMCO , MCI WORLDCOM COMMUNICATIONS, INC. , CHARTER FIBERLINKLINOIS, LLC , PEERLESS NETWORK OF ILLINOIS, LLC , MTCO COMMUNICATIONS, INC. , AMERITECH ILLINOIS , PAETEC COMMUNICATIONS, INC. , T-MOBILE USA, INC. , DIGITAL NETWORK ACCESS COMMUNICATIONS, INC. , MCLEODUSA TELECOMMUNICATIONS SERVICES, INC.

List of 779 Area-Code Phone Number Prefixes