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: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX: 238

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-238 A Washington Zone 16 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-238 0 Washington Zone 16 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236   2001-12-21   
301-238 1 Washington Zone 16 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236   2004-07-10   
301-238 2 Washington Zone 16 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-238 3 Washington Zone 16 MD TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-238 4 Washington Zone 16 MD CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236   2005-02-08   
301-238 5 Washington Zone 16 MD CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236   2007-02-23   
301-238 6 Washington Zone 16 MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-03-29   
301-238 7 Washington Zone 16 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-30   
301-238 8 Washington Zone 16 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-30   
301-238 9 Washington Zone 16 MD WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-05-22   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.