Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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NPA: 227 [Rate centres in NPA 227] [Dial plan for NPA 227]

NXX: 276

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-276 A Washington Zone 3 MD   876D ONVOY, LLC - MD 236   2025-06-06   
227-276 0 Washington Zone 3 MD   876D ONVOY, LLC - MD 236   2025-06-06   
227-276 1 Washington Zone 3 MD   876D ONVOY, LLC - MD 236   2025-06-06   
227-276 7 Washington Zone 3 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2025-10-04   
227-276 8 Washington Zone 3 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2025-10-04   
227-276 9 Washington Zone 3 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2025-09-29   

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

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