Illinois
Area codes
5
Rate centres
61
Carriers
46
Prefix blocks
1,530
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.
46 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC | 224C | 296 | 19.3% |
| FRONTIER NORTH, INC. - IL | 1015 | 229 | 15.0% |
| T-MOBILE USA, INC. | 6529 | 139 | 9.1% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 106 | 6.9% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 97 | 6.3% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 83 | 5.4% |
| ONVOY SPECTRUM, LLC | 624H | 68 | 4.4% |
| MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | 59 | 3.9% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 58 | 3.8% |
| STRATUS NETWORKS | 495J | 58 | 3.8% |
| TELNYX LLC | 073H | 49 | 3.2% |
| TERRA NOVA TELECOM INC. | 145J | 33 | 2.2% |
| METROPCS, INC. | 5562 | 30 | 2.0% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 25 | 1.6% |
| FRONTIER COMMUNICATIONS OF ILLINOIS, INC. | 1038 | 19 | 1.2% |
| COMCAST IP PHONE, LLC | 318J | 18 | 1.2% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 18 | 1.2% |
| FRONTIER COMMUNICATIONS-PRAIRIE, INC. | 1073 | 17 | 1.1% |
| COMMIO, LLC | 939H | 15 | 1.0% |
| VONAGE AMERICA LLC | 197D | 13 | 0.8% |
| YMAX COMMUNICATIONS CORP. - IL | 259E | 13 | 0.8% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 12 | 0.8% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 11 | 0.7% |
| FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL | 1000 | 9 | 0.6% |
| HD CARRIER LLC | 321J | 6 | 0.4% |
61 rate centres. search them all.