| AreaCode | 224 |
| Prefix | 204 |
| State | IL - Illinois |
| Telco Company Name | Neutral Tandem-Illinois, Llc - |
| Operating Company Number (OCN) | 505B |
| RateCenter | EVANSTON |
| Common Language Location Identifier Code (CLLI) | NOCLLIKNOWN |
| Prefix Type | CLEC |
| Local access and transport area (LATA) | 358 |