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: 340

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
475-340 A Old Greenwich CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920      
475-340 0 Old Greenwich CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2024-01-07   
475-340 2 Old Greenwich CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2023-11-05   
475-340 9 Old Greenwich CT HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2024-09-21   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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