Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 475 [Rate centres in NPA 475] [Dial plan for NPA 475]

NXX: 394

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-394 A Ansonia-Derby CT   7421 AT&T - LOCAL 920   2025-09-25   
475-394 0 Ansonia-Derby CT   199F BANDWIDTH.COM CLEC, LLC - CT 920   2026-02-22   
475-394 1 Ansonia-Derby CT   6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2026-03-04   
475-394 3 Ansonia-Derby CT   6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2025-11-24   
475-394 5 Ansonia-Derby CT   6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2025-10-03   
475-394 9 Ansonia-Derby CT   7421 AT&T - LOCAL 920   2025-09-25   

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

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