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: 691

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-691 A Poolesville MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-691 0 Poolesville MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2004-03-26   
301-691 1 Poolesville MD TYCRVA03AMD  2589 US LEC OF MARYLAND, INC. 236   2004-02-04   
301-691 2 Poolesville MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-10-09   
301-691 3 Poolesville MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2012-10-07   
301-691 4 Poolesville MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-06-27   
301-691 5 Poolesville MD SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
301-691 6 Poolesville MD CHCHMDBE1MD  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236   2015-06-20   
301-691 7 Poolesville MD WASIDCRG7MD  508J CENTURYLINK COMMUNICATIONS, LLC 236   2014-06-12   
301-691 8 Poolesville MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2015-02-18   
301-691 9 Poolesville MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.