Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 290

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-290 A Parkville MD BLTMMDDNDS2  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-290 0 Parkville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-290 1 Parkville MD   515J IP HORIZON LLC 238   2013-09-06   
443-290 2 Parkville MD BLTMMDDNDS2  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 238      
443-290 3 Parkville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-29   
443-290 4 Parkville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-01-06   
443-290 5 Parkville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-07   
443-290 6 Parkville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-03-31   
443-290 7 Parkville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-08-15   
443-290 8 Parkville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-03-31   
443-290 9 Parkville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-08-15   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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