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Area Codes > 312 > Central Office Codes

Exchange Rate Center State Operating Company
312-775 CHICGOZN01 IL AMERITECH ILLINOIS
312-776 IL
312-777 CHICGOZN01 IL TELEPORT COMMUNICATIONS GROUP - CHICAGO
312-780 CHICGOZN01 IL MCI WORLDCOM COMMUNICATIONS, INC. - IL
312-781 CHICGOZN01 IL AMERITECH ILLINOIS
312-782 CHICGOZN01 IL AMERITECH ILLINOIS
312-784 CHICGOZN01 IL GLOBALCOM, INC.-IL
312-786 CHICGOZN01 IL AMERITECH ILLINOIS
312-787 CHICGOZN01 IL AMERITECH ILLINOIS
312-788 CHICGOZN01 IL AMERITECH ILLINOIS
312-789 CHICGOZN01 IL AMERITECH ILLINOIS
312-790 CHICGOZN01 IL AMERITECH ILLINOIS
312-791 CHICGOZN01 IL AMERITECH ILLINOIS
312-793 CHICGOZN01 IL AMERITECH ILLINOIS
312-794 CHICGOZN01 IL RCN TELECOM SERVICES OF ILLINOIS, INC. - IL
312-795 CHICGOZN01 IL AMERITECH ILLINOIS
312-796 CHICGOZN01 IL AMERITECH ILLINOIS
312-797 CHICGOZN01 IL AMERITECH ILLINOIS
312-798 CHICGOZN01 IL AMERITECH ILLINOIS
312-799 CHICGOZN01 IL AMERITECH ILLINOIS
312-801 CHICGOZN01 IL ADBEEP, LLC
312-802 CHICGOZN01 IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
312-803 CHICGOZN01 IL MCI WORLDCOM COMMUNICATIONS, INC. - IL
312-804 CHICGOZN01 IL T-MOBILE USA, INC.
312-805 CHICGOZN01 IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
312-806 CHICGOZN01 IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-807 CHICGOZN01 IL AMERITECH ILLINOIS
312-808 CHICGOZN01 IL AMERITECH ILLINOIS
312-810 CHICGOZN01 IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-811 IL
312-812 CHICGOZN01 IL AMERITECH ILLINOIS
312-813 CHICGOZN01 IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-814 CHICGOZN01 IL AMERITECH ILLINOIS
312-816 HINSDALE IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-817 CHICGOZN01 IL AMERITECH ILLINOIS
312-818 CHICGOZN01 IL ADBEEP, LLC
312-819 CHICGOZN01 IL AMERITECH ILLINOIS
312-820 CHICGOZN01 IL ARCH WIRELESS HOLDINGS, INC.
312-821 CHICGOZN01 IL MCI WORLDCOM COMMUNICATIONS, INC. - IL
312-822 CHICGOZN01 IL AMERITECH ILLINOIS
312-823 CHICGOZN01 IL AMERITECH ILLINOIS
312-827 CHICGOZN01 IL AMERITECH ILLINOIS
312-828 CHICGOZN01 IL AMERITECH ILLINOIS
312-829 CHICGOZN01 IL AMERITECH ILLINOIS
312-830 CHICGOZN01 IL ARCH WIRELESS HOLDINGS, INC.
312-831 CHICGOZN01 IL AMERITECH ILLINOIS
312-832 CHICGOZN01 IL AMERITECH ILLINOIS
312-833 CHICGOZN01 IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
312-834 CHICGOZN01 IL AMERITECH ILLINOIS
312-835 CHICGOZN01 IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
312-836 CHICGOZN01 IL AMERITECH ILLINOIS
312-837 CHICGOZN01 IL ARCH WIRELESS HOLDINGS, INC.
312-839 CHICGOZN01 IL AMERICAN MESSAGING (AM), INC.
312-840 CHICGOZN01 IL AMERITECH ILLINOIS
312-841 CHICGOZN01 IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-842 CHICGOZN01 IL AMERITECH ILLINOIS
312-844 HINSDALE IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-845 CHICGOZN01 IL AMERITECH ILLINOIS
312-846 CHICGOZN01 IL AMERITECH ILLINOIS
312-848 CHICGOZN01 IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
312-849 CHICGOZN01 IL AMERITECH ILLINOIS
312-850 CHICGOZN01 IL AMERITECH ILLINOIS
312-851 CHICGOZN01 IL ARCH WIRELESS HOLDINGS, INC.
312-852 CHICGOZN01 IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-853 CHICGOZN01 IL AMERITECH ILLINOIS
312-854 CHICGOZN01 IL RCN TELECOM SERVICES OF ILLINOIS, INC. - IL
312-855 CHICGOZN01 IL AMERITECH ILLINOIS
312-856 CHICGOZN01 IL AMERITECH ILLINOIS
312-857 CHICGOZN01 IL AMERITECH ILLINOIS
312-859 CHICGOZN01 IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
312-860 CHICGOZN01 IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-861 CHICGOZN01 IL AMERITECH ILLINOIS
312-862 CHICGOZN01 IL AMERITECH ILLINOIS
312-863 CHICGOZN01 IL OVATION COMMUNICATIONS OF ILLINOIS, INC.
312-864 CHICGOZN01 IL AMERITECH ILLINOIS
312-865 WHEELING IL NEW CINGULAR WIRELESS PCS, LLC - IL
312-867 CHICGOZN01 IL AMERITECH ILLINOIS
312-869 CHICGOZN01 IL AMERITECH ILLINOIS
312-870 CHICGOZN01 IL GLOBALCOM, INC.-IL
312-872 IL
312-873 CHICGOZN01 IL MCI WORLDCOM COMMUNICATIONS, INC. - IL
312-875 CHICGOZN01 IL AMERITECH ILLINOIS
312-876 CHICGOZN01 IL AMERITECH ILLINOIS
312-877 CHICGOZN01 IL ADBEEP, LLC
312-878 CHICGOZN01 IL PEERLESS NETWORK OF ILLINOIS, LLC - IL
312-879 CHICGOZN01 IL AMERITECH ILLINOIS
312-880 CHICGOZN01 IL AMERITECH ILLINOIS
312-881 CHICGOZN01 IL OVATION COMMUNICATIONS OF ILLINOIS, INC.
312-882 CHICGOZN01 IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
312-884 CHICGOZN01 IL OVATION COMMUNICATIONS OF ILLINOIS, INC.
312-886 CHICGOZN01 IL AMERITECH ILLINOIS
312-887 CHICGOZN01 IL AMERITECH ILLINOIS
312-890 CHICGOZN01 IL SPRINT SPECTRUM L.P.
312-891 CHICGOZN01 IL ARCH WIRELESS HOLDINGS, INC.
312-892 CHICGOZN01 IL BROADWING COMMUNICATIONS, LLC - IL
312-893 CHICGOZN01 IL BROADWING COMMUNICATIONS, LLC - IL
312-894 CHICGOZN01 IL MCIMETRO, ATS, INC.
312-895 CHICGOZN01 IL BROADWING COMMUNICATIONS, LLC - IL
312-896 CHICGOZN01 IL BROADWING COMMUNICATIONS, LLC - IL
312-897 CHICGOZN01 IL ADBEEP, LLC