Illinois
Area codes
3
Rate centres
52
Carriers
34
Prefix blocks
773
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.
34 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC | 224C | 147 | 19.0% |
| UNITED STATES CELLULAR - IL | 6265 | 90 | 11.6% |
| CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL | 1183 | 82 | 10.6% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 72 | 9.3% |
| FRONTIER NORTH, INC. - IL | 1015 | 47 | 6.1% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | 40 | 5.2% |
| MCC TELEPHONY LLC | 593K | 32 | 4.1% |
| LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | 31 | 4.0% |
| BRIGHTSPEED OF ILLINOIS, LLC | 1057 | 28 | 3.6% |
| ONVOY SPECTRUM, LLC | 624H | 28 | 3.6% |
| STRATUS NETWORKS | 495J | 27 | 3.5% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 23 | 3.0% |
| MTC COMMUNICATIONS, INC. - IL | 342F | 18 | 2.3% |
| T-MOBILE USA, INC. | 6529 | 17 | 2.2% |
| MCDONOUGH TEL. COOP. | 1047 | 12 | 1.6% |
| COMCAST IP PHONE, LLC | 318J | 11 | 1.4% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | 11 | 1.4% |
| MID CENTURY TEL. COOP., INC. | 1054 | 7 | 0.9% |
| TELNYX LLC | 073H | 7 | 0.9% |
| METROPCS, INC. | 5562 | 6 | 0.8% |
| ADAMS TELSYSTEMS, INC. | 7091 | 5 | 0.6% |
| NUSO, LLC | 732J | 4 | 0.5% |
| SKYE TELECOM LLC DBA SKYETEL | 622J | 4 | 0.5% |
| TWILIO INTERNATIONAL, INC. | 506J | 4 | 0.5% |
| NUSO, LLC | 551G | 3 | 0.4% |
52 rate centres. search them all.