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: 877

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-877 A Frederick MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240      
240-877 0 Frederick MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-10-09   
240-877 1 Frederick MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-10-09   
240-877 2 Frederick MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240   2016-10-09   
240-877 3 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240   2017-03-06   
240-877 4 Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2017-09-13   
240-877 5 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240   2017-08-05   
240-877 6 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240   2017-10-02   
240-877 7 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2016-11-06   
240-877 8 Frederick MD FRDRMDFRKMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240   2017-04-06   
240-877 9 Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2018-07-09   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.