OLNEY — IL
Data last updated: October 30, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 10 |
| FRONTIER NORTH, INC. - IL | 1015 | 3 |
| ONVOY, LLC | 224C | 2 |
| ONVOY SPECTRUM, LLC | 624H | 2 |
| PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | 1 |