Illinois
Area codes
2
Rate centres
59
Carriers
33
Prefix blocks
1,108
A Local Access and Transport Area is the region a call is routed within before it becomes long-haul. The boundaries were drawn when the Bell System was broken up in 1984: a local carrier could carry a call inside its LATA, and a long-distance carrier had to take it across one. The division still shapes how calls are routed and rated today, which is why every prefix block on this site carries a LATA.
33 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 457 | 41.2% |
| ONVOY, LLC | 224C | 128 | 11.6% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 100 | 9.0% |
| CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL | 1183 | 61 | 5.5% |
| ILLINOIS CONSOLIDATED TEL. CO. | 1037 | 57 | 5.1% |
| T-MOBILE USA, INC. | 6529 | 54 | 4.9% |
| MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | 52 | 4.7% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 39 | 3.5% |
| TERRA NOVA TELECOM INC. | 145J | 26 | 2.3% |
| FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL | 1000 | 25 | 2.3% |
| TELNYX LLC | 073H | 18 | 1.6% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 16 | 1.4% |
| COMPUTER TECHNIQUES, INC. - IL | 197H | 15 | 1.4% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 9 | 0.8% |
| METROPCS, INC. | 5562 | 9 | 0.8% |
| HD CARRIER LLC | 321J | 5 | 0.5% |
| MONTROSE MUTUAL TEL. CO. | 1058 | 4 | 0.4% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 3 | 0.3% |
| FIDIUM ENTERPRISE SERVICES, LLC | 911E | 3 | 0.3% |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | 3 | 0.3% |
| AMERICAN MESSAGING SERVICES, LLC | 9748 | 2 | 0.2% |
| COMCAST IP PHONE, LLC | 318J | 2 | 0.2% |
| EXIANT COMMUNICATIONS LLC | 114J | 2 | 0.2% |
| FRONTIER COMMUNICATIONS OF LAKESIDE, INC. | 1011 | 2 | 0.2% |
| IP HORIZON LLC | 515J | 2 | 0.2% |
59 rate centres. search them all.