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: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 539

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-539 A Columbia MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-539 0 Columbia MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-539 1 Columbia MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-539 2 Columbia MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-539 3 Columbia MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      
443-539 4 Columbia MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-539 5 Columbia MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
443-539 6 Columbia MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-539 7 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-539 8 Columbia MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-539 9 Columbia MD CLMAMDJTAMD  2589 US LEC OF MARYLAND, INC. 238      

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.