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 |