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: 840

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-840 A Frederick MD FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240      
240-840 0 Frederick MD FRDRMDFRKMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240      
240-840 1 Frederick MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240      
240-840 2 Frederick MD FRDRMDFRIMD  551G NUSO, LLC 240      
240-840 3 Frederick MD FRDRMDFRIMD  551G NUSO, LLC 240      
240-840 4 Frederick MD FRDRMDFRIMD  551G NUSO, LLC 240      
240-840 5 Frederick MD FRDRMDFRIMD  551G NUSO, LLC 240      
240-840 6 Frederick MD FRDRMDFRKMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240      
240-840 7 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240      
240-840 8 Frederick MD FRDRMDFRXPX  624H ONVOY SPECTRUM, LLC 240      
240-840 9 Frederick MD FRDRMDFRIMD  551G NUSO, LLC 240      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.