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:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-553 A Washington Zone 13 MD WASHDCRKDS3  8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-553 0 Washington Zone 13 MD   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-553 1 Washington Zone 13 MD   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-553 3 Washington Zone 13 MD   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-553 4 Washington Zone 13 MD   5562 METRO PCS, INC. 236   2018-06-18   
240-553 7 Washington Zone 13 MD   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2013-09-05   
240-553 8 Washington Zone 13 MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-04-23   
240-553 9 Washington Zone 13 MD   8992 ALLEGIANCE TELECOM, INC. - MD 236      

Last updated: Wed, 10 Apr 2019 01:22:05 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.