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.

Ellicott City, MD

<< 1 2 3 4 5 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-720 A CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-720 0   9212 VERIZON MARYLAND, INC. 238      
410-720 1   9212 VERIZON MARYLAND, INC. 238      
410-720 2   318J COMCAST IP PHONE, LLC 238   2007-07-30   
410-720 3   9212 VERIZON MARYLAND, INC. 238      
410-720 4   9212 VERIZON MARYLAND, INC. 238      
410-720 5   9212 VERIZON MARYLAND, INC. 238      
410-720 6   9212 VERIZON MARYLAND, INC. 238      
410-720 7   9212 VERIZON MARYLAND, INC. 238      
410-720 8   9212 VERIZON MARYLAND, INC. 238      
410-720 9   281E YMAX COMMUNICATIONS CORP. - MD 238   2007-08-20   
410-748 A HNVAMDAE3MD  6630 USA MOBILITY WIRELESS, INC. 238      
410-750 A ELCYMDELDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 A SYVLMDSKDS0  9212 VERIZON MARYLAND, INC. 238      
410-781 0   9212 VERIZON MARYLAND, INC. 238      
410-781 1   876D ONVOY, LLC - MD 238   2016-03-10   
410-781 2   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2006-05-04   
410-781 3   876D ONVOY, LLC - MD 238   2024-04-13   
410-781 4   9212 VERIZON MARYLAND, INC. 238      
410-781 5   964H BARR TELL USA, INC. 238   2016-12-17   
410-781 6   9212 VERIZON MARYLAND, INC. 238      
410-781 7   9212 VERIZON MARYLAND, INC. 238      
410-781 8   281E YMAX COMMUNICATIONS CORP. - MD 238   2008-04-16   
410-781 9   145J TERRA NOVA TELECOM INC. 238   2024-02-15   
410-988 A CLVLMDCERP0  9212 VERIZON MARYLAND, INC. 238   2024-01-30   
410-988 0   281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-26   
410-988 1   829J PAETEC ITEL, LLC 238   2005-03-10   
410-988 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-09-10   
410-988 5   318J COMCAST IP PHONE, LLC 238   2006-10-21   
410-988 6   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-03   
410-988 7   281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-26   
410-988 8   318J COMCAST IP PHONE, LLC 238   2015-11-25   
410-988 9   9212 VERIZON MARYLAND, INC. 238      
410-995 A CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
410-995 0   9212 VERIZON MARYLAND, INC. 238      
410-995 1   9212 VERIZON MARYLAND, INC. 238      
410-995 2   9212 VERIZON MARYLAND, INC. 238      
410-995 3   9212 VERIZON MARYLAND, INC. 238      
410-995 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
410-995 5   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
410-995 6   9212 VERIZON MARYLAND, INC. 238      
410-995 7   071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
410-995 8   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
410-995 9   876D ONVOY, LLC - MD 238   2016-03-27   
443-288 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-288 2   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      

<< 1 2 3 4 5 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.