Illinois, Wisconsin
Area codes
3
Rate centres
37
Carriers
49
Prefix blocks
1,857
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.
49 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| UNITED STATES CELLULAR - IL | 6265 | 304 | 16.4% |
| ONVOY, LLC | 224C | 278 | 15.0% |
| T-MOBILE USA, INC. | 6529 | 173 | 9.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 147 | 7.9% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 132 | 7.1% |
| FRONTIER NORTH, INC. - IL | 1036 | 105 | 5.7% |
| ILLINOIS BELL TEL CO | 9329 | 105 | 5.7% |
| FRONTIER NORTH, INC. - IL | 1015 | 80 | 4.3% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 79 | 4.3% |
| COMCAST IP PHONE, LLC | 318J | 52 | 2.8% |
| AERO NORTH COMMUNICATIONS, INC. - IL | 443F | 40 | 2.2% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 34 | 1.8% |
| PAETEC ITEL, LLC | 829J | 32 | 1.7% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 32 | 1.7% |
| MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | 27 | 1.5% |
| METROPCS, INC. | 5562 | 27 | 1.5% |
| ONVOY SPECTRUM, LLC | 624H | 27 | 1.5% |
| STRATUS NETWORKS | 495J | 20 | 1.1% |
| TERRA NOVA TELECOM INC. | 145J | 20 | 1.1% |
| TELNYX LLC | 073H | 18 | 1.0% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | 13 | 0.7% |
| COMMIO, LLC | 939H | 12 | 0.6% |
| FRACTEL, LLC | 965H | 11 | 0.6% |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 10 | 0.5% |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 8 | 0.4% |
37 rate centres. search them all.