Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 659

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-659 A West River MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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