Illinois, Indiana, Wisconsin
Area codes
13
Rate centres
218
Carriers
90
Prefix blocks
44,961
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.
90 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| T-MOBILE USA, INC. | 6529 | 8,919 | 19.8% |
| ILLINOIS BELL TEL CO | 9329 | 5,261 | 11.7% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 5,050 | 11.2% |
| ONVOY, LLC | 224C | 4,725 | 10.5% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 3,109 | 6.9% |
| BANDWIDTH.COM CLEC, LLC - IL | 984E | 2,478 | 5.5% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 2,408 | 5.4% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 1,178 | 2.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1,121 | 2.5% |
| FIRST COMMUNICATIONS, LLC | 460K | 1,114 | 2.5% |
| COMCAST IP PHONE, LLC | 318J | 1,111 | 2.5% |
| PAETEC ITEL, LLC | 829J | 1,039 | 2.3% |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | 747 | 1.7% |
| ONVOY SPECTRUM, LLC | 624H | 674 | 1.5% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 651 | 1.4% |
| METROPCS, INC. | 5562 | 582 | 1.3% |
| INDIANA BELL TEL CO INC | 9325 | 370 | 0.8% |
| ONVOY, LLC - IN | 097D | 349 | 0.8% |
| TELNYX LLC | 073H | 291 | 0.6% |
| RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | 276 | 0.6% |
| IP HORIZON LLC | 515J | 274 | 0.6% |
| AT&T CORP. | 516C | 247 | 0.5% |
| ACCESS ONE, INC. - IL | 5447 | 245 | 0.5% |
| COMMIO, LLC | 939H | 239 | 0.5% |
| FRACTEL, LLC | 965H | 239 | 0.5% |
218 rate centres. search them all.