Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 227 [Rate centres in NPA 227] [Dial plan for NPA 227]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-999 7 Washington Zone 10 MD WASHDCSWNMD  321J HD CARRIER LLC 236   2023-12-15   
227-999 8 Washington Zone 10 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-02-19   
227-999 9 Washington Zone 10 MD WASHDCSWFMD  530H WIDE VOICE, LLC - MD 236   2023-12-15   

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Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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