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: 345

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-345 A Ashton (Baltimore LATA) MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
240-345 0 Ashton (Baltimore LATA) MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-02-15   
240-345 1 Ashton (Baltimore LATA) MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2011-09-02   
240-345 2 Ashton (Baltimore LATA) MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-08-12   
240-345 3 Ashton (Baltimore LATA) MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-08-11   
240-345 4 Ashton (Baltimore LATA) MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2007-12-01   
240-345 5 Ashton (Baltimore LATA) MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2007-08-20   
240-345 6 Ashton (Baltimore LATA) MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-04-16   
240-345 7 Ashton (Baltimore LATA) MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-06-16   
240-345 8 Ashton (Baltimore LATA) MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-06-16   
240-345 9 Ashton (Baltimore LATA) MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-07-18   

Last updated: Fri, 10 Jul 2026 02:55:48 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.