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: 302

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-302 A Washington Zone 4 MD   490J BOOST SUBSCRIBERCO L.L.C. 236   2026-06-04   
227-302 0 Washington Zone 4 MD   490J BOOST SUBSCRIBERCO L.L.C. 236   2026-06-04   
227-302 1 Washington Zone 4 MD   490J BOOST SUBSCRIBERCO L.L.C. 236   2026-07-28   
227-302 2 Washington Zone 4 MD   490J BOOST SUBSCRIBERCO L.L.C. 236   2026-08-25   
227-302 3 Washington Zone 4 MD   490J BOOST SUBSCRIBERCO L.L.C. 236   2026-09-28   
227-302 9 Washington Zone 4 MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2026-07-13   

Last updated: Sat, 04 Jul 2026 13:07:56 UTC

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