Illinois
Area codes
3
Rate centres
91
Carriers
53
Prefix blocks
3,211
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.
53 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 513 | 16.0% |
| ONVOY, LLC | 224C | 486 | 15.1% |
| FRONTIER NORTH, INC. - IL | 1015 | 316 | 9.8% |
| ILLINOIS BELL TEL CO | 9329 | 199 | 6.2% |
| T-MOBILE USA, INC. | 6529 | 186 | 5.8% |
| UNITED STATES CELLULAR - IL | 6265 | 163 | 5.1% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 152 | 4.7% |
| BANDWIDTH.COM CLEC, LLC - IL | 984E | 142 | 4.4% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 137 | 4.3% |
| ONVOY SPECTRUM, LLC | 624H | 128 | 4.0% |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | 94 | 2.9% |
| STRATUS NETWORKS | 495J | 88 | 2.7% |
| TERRA NOVA TELECOM INC. | 145J | 84 | 2.6% |
| BRIGHTSPEED OF ILLINOIS, LLC | 1057 | 68 | 2.1% |
| COMCAST IP PHONE, LLC | 318J | 61 | 1.9% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 56 | 1.7% |
| MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | 56 | 1.7% |
| TELNYX LLC | 073H | 37 | 1.2% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 30 | 0.9% |
| METROPCS, INC. | 5562 | 26 | 0.8% |
| COMMIO, LLC | 939H | 19 | 0.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 19 | 0.6% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 17 | 0.5% |
| AT&T CORP. | 516C | 15 | 0.5% |
| FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL | 1000 | 12 | 0.4% |
91 rate centres. search them all.