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: 275

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-275 A Washington Zone 4 MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2025-06-01   
227-275 0 Washington Zone 4 MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2025-06-01   
227-275 1 Washington Zone 4 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-08-21   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

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