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
443-418 9 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-419 A Glenwood MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-419 0 Glenwood MD   829J PAETEC ITEL, LLC 238      
443-419 1 Glenwood MD   829J PAETEC ITEL, LLC 238   2004-03-09   
443-419 2 Glenwood MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
443-419 3 Glenwood MD   829J PAETEC ITEL, LLC 238   2006-04-24   
443-419 4 Glenwood MD   876D ONVOY, LLC - MD 238   2024-03-03   
443-419 5 Glenwood MD   318J COMCAST IP PHONE, LLC 238   2015-04-20   
443-419 6 Glenwood MD   876D ONVOY, LLC - MD 238   2016-04-04   
443-419 7 Glenwood MD   876D ONVOY, LLC - MD 238   2016-04-04   
443-419 8 Glenwood MD   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-11   
443-419 9 Glenwood MD   515J IP HORIZON LLC 238   2015-03-21   
443-420 A Ellicott City MD   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-420 2 Ellicott City MD   5562 METROPCS, INC. 238   2018-10-05   
443-420 3 Ellicott City MD   318J COMCAST IP PHONE, LLC 238   2019-03-20   
443-420 5 Ellicott City MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2025-08-15   
443-420 6 Ellicott City MD   876D ONVOY, LLC - MD 238   2016-04-08   
443-420 7 Ellicott City MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-22   
443-420 8 Ellicott City MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-22   
443-420 9 Ellicott City MD   876D ONVOY, LLC - MD 238   2016-04-08   
443-421 A Fork MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-422 A Glen Burnie MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-422 0 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-05-26   
443-422 1 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-05-10   
443-422 2 Glen Burnie MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-04-29   
443-422 3 Glen Burnie MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-06-26   
443-422 4 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-02-05   
443-422 5 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-02-05   
443-422 6 Glen Burnie MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2012-11-25   
443-422 7 Glen Burnie MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-04-03   
443-422 8 Glen Burnie MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2010-12-03   
443-422 9 Glen Burnie MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-08-18   
443-423 A Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-423 0 Baltimore MD   829J PAETEC ITEL, LLC 238   2005-10-12   
443-423 1 Baltimore MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-423 2 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-01-27   
443-423 3 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-01-27   
443-423 4 Baltimore MD   9212 VERIZON MARYLAND, INC. 238   2003-09-06   
443-423 5 Baltimore MD   9212 VERIZON MARYLAND, INC. 238   2003-09-06   
443-423 6 Baltimore MD   9212 VERIZON MARYLAND, INC. 238   2003-09-06   
443-423 7 Baltimore MD   9212 VERIZON MARYLAND, INC. 238   2003-09-06   
443-423 8 Baltimore MD   9212 VERIZON MARYLAND, INC. 238   2004-06-04   
443-423 9 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-01-27   
443-424 A Cardiff MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-424 0 Cardiff MD   420C ARMSTRONG TELECOMMUNICATIONS, INC. - MD 238   2008-09-08   
443-424 1 Cardiff MD   829J PAETEC ITEL, LLC 238   2004-02-02   
443-424 2 Cardiff MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-424 3 Cardiff MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-08-15   
443-424 4 Cardiff MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-07   
443-424 5 Cardiff MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-28   

<< 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.