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 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-917 4 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2013-07-22   
443-917 5 Columbia MD   145J TERRA NOVA TELECOM INC. 238   2024-09-11   
443-917 6 Columbia MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-917 7 Columbia MD   508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
443-917 8 Columbia MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
443-917 9 Columbia MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
443-918 A Taneytown MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-918 0 Taneytown MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-918 1 Taneytown MD   829J PAETEC ITEL, LLC 238   2007-04-24   
443-918 2 Taneytown MD   829J PAETEC ITEL, LLC 238   2004-02-05   
443-918 3 Taneytown MD   829J PAETEC ITEL, LLC 238   2005-10-07   
443-918 4 Taneytown MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2010-02-01   
443-918 5 Taneytown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-03-05   
443-918 6 Taneytown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2012-02-24   
443-918 7 Taneytown MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-25   
443-918 8 Taneytown MD   318J COMCAST IP PHONE, LLC 238   2007-01-19   
443-918 9 Taneytown MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-919 A Baltimore MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-920 A Sykesville MD CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-920 0 Sykesville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-07-28   
443-920 1 Sykesville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-920 2 Sykesville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-920 3 Sykesville MD   318J COMCAST IP PHONE, LLC 238   2009-05-21   
443-920 4 Sykesville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-06-07   
443-920 5 Sykesville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-06-07   
443-920 6 Sykesville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-920 7 Sykesville MD   876D ONVOY, LLC - MD 238   2016-03-25   
443-920 8 Sykesville MD   876D ONVOY, LLC - MD 238   2016-03-25   
443-920 9 Sykesville MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-921 A Towson MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-921 0 Towson MD   829J PAETEC ITEL, LLC 238      
443-921 1 Towson MD   829J PAETEC ITEL, LLC 238      
443-921 2 Towson MD   829J PAETEC ITEL, LLC 238      
443-921 3 Towson MD   829J PAETEC ITEL, LLC 238      
443-921 4 Towson MD   829J PAETEC ITEL, LLC 238      
443-921 5 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-921 6 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-921 7 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-07   
443-921 8 Towson MD   829J PAETEC ITEL, LLC 238      
443-921 9 Towson MD   829J PAETEC ITEL, LLC 238      
443-922 A Edgewood MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-922 0 Edgewood MD   5562 METROPCS, INC. 238   2019-01-05   
443-922 1 Edgewood MD   5562 METROPCS, INC. 238   2018-02-08   
443-922 2 Edgewood MD   829J PAETEC ITEL, LLC 238   2006-03-31   
443-922 3 Edgewood MD   5562 METROPCS, INC. 238   2018-10-19   
443-922 4 Edgewood MD   5562 METROPCS, INC. 238   2018-04-09   
443-922 5 Edgewood MD   5562 METROPCS, INC. 238   2016-03-05   
443-922 6 Edgewood MD   5562 METROPCS, INC. 238   2016-03-05   
443-922 7 Edgewood MD   318J COMCAST IP PHONE, LLC 238   2006-12-12   
443-922 8 Edgewood MD   5562 METROPCS, INC. 238   2016-03-05   

<< 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 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 >>

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.