Local Calling Guide

Area code/prefix search

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NPA: 773 [Rate centres in NPA 773] [Dial plan for NPA 773]

NXX: 222

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
773-222 A Chicago Zone 01-Calumet IL LBRDILGOAMD  6630 SPOK, INC. 358      

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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