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: 307

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-307 A Washington Zone 2 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-09-06   
227-307 8 Washington Zone 2 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-09-07   
227-307 9 Washington Zone 2 MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2026-09-06   

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

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