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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Switch: BTVLMD18G00

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
227-202 A Washington Zone 10 MD 4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
227-216 A Washington Zone 10 MD 4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-750 A Gaithersburg MD 4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-974 A Washington Zone 10 MD 4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
240-987 A Washington Zone 10 MD 4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-201 A Washington Zone 10 MD 4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-550 A Washington Zone 10 MD 4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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