| AreaCode | 872 |
| Prefix | 401 |
| City | Elgin |
| State | IL - Illinois |
| Telco Company Name | Neutral Tandem-Illinois, Llc |
| Operating Company Number (OCN) | 224C |
| RateCenter | CHICGOZN07 |
| Common Language Location Identifier Code (CLLI) | NOCLLIKNOWN |
| Prefix Type | CLEC |
| Local access and transport area (LATA) | 358 |