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: 361

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-361 A Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236   2025-04-02   
240-361 0 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
240-361 1 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
240-361 2 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
240-361 3 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
240-361 4 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
240-361 5 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
240-361 6 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
240-361 7 Gaithersburg MD CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-01-28   
240-361 8 Gaithersburg MD CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-01-28   
240-361 9 Gaithersburg MD WASHDCSW01Z  829J PAETEC ITEL, LLC 236      

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.