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: 240 [Rate centres in NPA 240] [Dial plan for NPA 240]

NXX: 621

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-621 A Washington Zone 11 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236      
240-621 0 Washington Zone 11 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-01-27   
240-621 1 Washington Zone 11 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2013-06-16   
240-621 2 Washington Zone 11 MD WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2013-06-16   
240-621 3 Washington Zone 11 MD WASHDCCZDS1  4773 XO MARYLAND, LLC 236   2011-10-23   
240-621 4 Washington Zone 11 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-28   
240-621 5 Washington Zone 11 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-28   
240-621 6 Washington Zone 11 MD   515J IP HORIZON LLC 236   2017-07-07   
240-621 7 Washington Zone 11 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2011-12-10   
240-621 8 Washington Zone 11 MD WASHDC127MD  073H TELNYX LLC 236   2017-03-14   
240-621 9 Washington Zone 11 MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2018-10-24   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.