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
443-301 1 Baltimore MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2013-10-01   
443-301 2 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-301 3 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-301 4 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-301 5 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-301 6 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-301 7 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-301 8 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-301 9 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-06-07   
443-302 A Crofton MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-302 0 Crofton MD   145J TERRA NOVA TELECOM INC. 238   2024-10-12   
443-302 2 Crofton MD   318J COMCAST IP PHONE, LLC 238   2008-03-20   
443-302 3 Crofton MD   876D ONVOY, LLC - MD 238   2021-05-21   
443-302 6 Crofton MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-302 7 Crofton MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-02-12   
443-302 8 Crofton MD   876D ONVOY, LLC - MD 238   2021-05-21   
443-302 9 Crofton MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-303 A Aberdeen MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
443-303 0 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-07-24   
443-303 1 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-07-24   
443-303 2 Aberdeen MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2004-11-22   
443-303 3 Aberdeen MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 236   2007-04-15   
443-303 4 Aberdeen MD   145J TERRA NOVA TELECOM INC. 236   2025-02-13   
443-303 5 Aberdeen MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
443-303 6 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2011-10-06   
443-303 7 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-02-11   
443-303 8 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2007-02-19   
443-303 9 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2010-06-06   
443-304 A Arbutus MD   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-304 0 Arbutus MD   145J TERRA NOVA TELECOM INC. 238   2024-10-12   
443-304 1 Arbutus MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2025-02-10   
443-304 2 Arbutus MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-304 3 Arbutus MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2006-10-14   
443-304 5 Arbutus MD   939H COMMIO, LLC 238   2021-06-12   
443-304 6 Arbutus MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2006-10-20   
443-304 7 Arbutus MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-25   
443-304 8 Arbutus MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-10-28   
443-304 9 Arbutus MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-27   
443-305 A Armiger-Gibson Island MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-305 2 Armiger-Gibson Island MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-305 3 Armiger-Gibson Island MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-08   
443-305 5 Armiger-Gibson Island MD   876D ONVOY, LLC - MD 238   2021-03-04   
443-305 6 Armiger-Gibson Island MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-16   
443-305 7 Armiger-Gibson Island MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-09-16   
443-305 8 Armiger-Gibson Island MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-06-26   
443-305 9 Armiger-Gibson Island MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-306 A Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-306 0 Severna Park MD   5562 METROPCS, INC. 238      
443-306 1 Severna Park MD   5562 METROPCS, INC. 238      
443-306 2 Severna Park MD   5562 METROPCS, INC. 238   2009-01-08   

<< 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: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.