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]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-325 3 Ellicott City MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-325 4 Ellicott City MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-02-01   
443-325 5 Ellicott City MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-01-06   
443-325 6 Ellicott City MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2016-02-04   
443-325 7 Ellicott City MD   829J PAETEC ITEL, LLC 238      
443-325 8 Ellicott City MD   829J PAETEC ITEL, LLC 238      
443-325 9 Ellicott City MD   829J PAETEC ITEL, LLC 238      
443-326 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-327 A Aberdeen MD   829J PAETEC ITEL, LLC 236   2025-04-01   
443-327 0 Aberdeen MD   829J PAETEC ITEL, LLC 236      
443-327 1 Aberdeen MD   829J PAETEC ITEL, LLC 236   2002-05-20   
443-327 2 Aberdeen MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-10-13   
443-327 3 Aberdeen MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-10-13   
443-327 4 Aberdeen MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-10-13   
443-327 5 Aberdeen MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-10-13   
443-327 6 Aberdeen MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 236   2006-09-18   
443-327 7 Aberdeen MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 236   2006-09-18   
443-327 8 Aberdeen MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 236   2005-07-25   
443-327 9 Aberdeen MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 236   2008-12-11   
443-328 A Sykesville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-328 0 Sykesville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   
443-328 1 Sykesville MD   829J PAETEC ITEL, LLC 238      
443-328 2 Sykesville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-328 3 Sykesville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
443-328 4 Sykesville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
443-328 5 Sykesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2015-10-16   
443-328 6 Sykesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-01-26   
443-328 7 Sykesville MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-328 8 Sykesville MD   515J IP HORIZON LLC 238   2016-05-31   
443-328 9 Sykesville MD   515J IP HORIZON LLC 238   2015-03-21   
443-329 A Waterloo (Washington DC LATA) MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
443-329 2 Waterloo (Washington DC LATA) MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-02-20   
443-329 3 Waterloo (Washington DC LATA) MD WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2009-01-15   
443-329 4 Waterloo (Washington DC LATA) MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
443-329 5 Waterloo (Washington DC LATA) MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-06-20   
443-329 6 Waterloo (Washington DC LATA) MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-30   
443-329 7 Waterloo (Washington DC LATA) MD   2593 CORE COMMUNICATIONS, INC.- MD 236   2019-04-30   
443-329 8 Waterloo (Washington DC LATA) MD WASHDC127MD  073H TELNYX LLC 236   2017-04-27   
443-329 9 Waterloo (Washington DC LATA) MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-06-20   
443-330 A Cockeysville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-330 0 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-330 1 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-330 2 Cockeysville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-22   
443-330 3 Cockeysville MD   829J PAETEC ITEL, LLC 238   2005-03-10   
443-330 4 Cockeysville MD   829J PAETEC ITEL, LLC 238   2004-09-05   
443-330 5 Cockeysville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2006-10-22   
443-330 6 Cockeysville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2011-04-13   
443-330 7 Cockeysville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2013-09-08   
443-330 8 Cockeysville MD MANRMDMNRS0  9212 VERIZON MARYLAND, INC. 238   2006-10-16   
443-330 9 Cockeysville MD   829J PAETEC ITEL, LLC 238      
443-331 A Taneytown MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-331 0 Taneytown MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-331 1 Taneytown MD   829J PAETEC ITEL, LLC 238      
443-331 2 Taneytown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-03-03   
443-331 3 Taneytown MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-11-25   
443-331 4 Taneytown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   
443-331 5 Taneytown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   
443-331 7 Taneytown MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-331 8 Taneytown MD BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-07-17   
443-331 9 Taneytown MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-08   
443-332 A Crofton MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-332 0 Crofton MD   829J PAETEC ITEL, LLC 238      
443-332 1 Crofton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-09-12   
443-332 2 Crofton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2021-08-30   
443-332 3 Crofton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-03-03   
443-332 4 Crofton MD   829J PAETEC ITEL, LLC 238   2002-07-12   
443-332 5 Crofton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2021-08-30   
443-332 6 Crofton MD   829J PAETEC ITEL, LLC 238   2006-03-28   
443-332 7 Crofton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   
443-332 8 Crofton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-11-29   
443-332 9 Crofton MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   
443-333 A Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-333 0 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-06-02   
443-333 1 Annapolis MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-19   
443-333 2 Annapolis MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-11-13   
443-333 3 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-04-15   
443-333 4 Annapolis MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2011-11-09   
443-333 5 Annapolis MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2010-07-18   
443-333 6 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-06-23   
443-333 7 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-06-23   
443-333 8 Annapolis MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-10-28   
443-333 9 Annapolis MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-11-28   
443-334 A Pikesville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-334 0 Pikesville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-334 1 Pikesville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-334 2 Pikesville MD PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238   2003-10-30   
443-334 3 Pikesville MD PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238   2003-10-30   
443-334 4 Pikesville MD   829J PAETEC ITEL, LLC 238   2005-03-10   
443-334 5 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2013-10-30   
443-334 6 Pikesville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2016-09-08   
443-334 7 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-10-24   
443-334 8 Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2007-12-04   
443-334 9 Pikesville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-22   
443-335 A Brooklyn Park-Linthicum MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-335 2 Brooklyn Park-Linthicum MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2018-11-18   
443-335 4 Brooklyn Park-Linthicum MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2019-10-13   
443-335 5 Brooklyn Park-Linthicum MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2020-01-24   
443-335 6 Brooklyn Park-Linthicum MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2020-10-26   
443-335 8 Brooklyn Park-Linthicum MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-03-04   
443-335 9 Brooklyn Park-Linthicum MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-03-04   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 >>

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.