Local Calling Guide
Area code/prefix search
NPA: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]
NXX: 553
NPA-NXX | BLOCK | Rate Centre | Region | Switch | OCN | LATA | LIR | Eff date | Disc date |
---|---|---|---|---|---|---|---|---|---|
312-553 | A | Chicago Zone 01-Franklin | IL | CHCGILFRDS0 | 9329 ILLINOIS BELL TEL CO | 358 |
Last updated: Wed, 20 Nov 2024 21:20:06 UTC
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