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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 227 [Rate centres in NPA 227] [Dial plan for NPA 227]

NXX: 230

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
227-230 A Washington Zone 5 MD   876D ONVOY, LLC - MD 236   2024-03-30   
227-230 0 Washington Zone 5 MD   876D ONVOY, LLC - MD 236   2024-03-30   
227-230 1 Washington Zone 5 MD   876D ONVOY, LLC - MD 236   2024-03-30   
227-230 2 Washington Zone 5 MD   876D ONVOY, LLC - MD 236   2024-05-03   
227-230 8 Washington Zone 5 MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2024-03-31   
227-230 9 Washington Zone 5 MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2024-03-31   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.