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
443-574 6 Ellicott City MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-08-19   
443-574 7 Ellicott City MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-08-28   
443-574 8 Ellicott City MD   829J PAETEC ITEL, LLC 238   2003-05-25   
443-574 9 Ellicott City MD   829J PAETEC ITEL, LLC 238      
443-575 A Arbutus MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-575 0 Arbutus MD   829J PAETEC ITEL, LLC 238      
443-575 1 Arbutus MD   624H ONVOY SPECTRUM, LLC 238   2021-02-24   
443-575 2 Arbutus MD   829J PAETEC ITEL, LLC 238      
443-575 3 Arbutus MD   624H ONVOY SPECTRUM, LLC 238   2021-02-24   
443-575 4 Arbutus MD   829J PAETEC ITEL, LLC 238   2006-11-09   
443-575 5 Arbutus MD   829J PAETEC ITEL, LLC 238      
443-575 6 Arbutus MD   318J COMCAST IP PHONE, LLC 238   2007-04-10   
443-575 7 Arbutus MD   829J PAETEC ITEL, LLC 238   2011-12-20   
443-575 8 Arbutus MD   624H ONVOY SPECTRUM, LLC 238   2021-02-24   
443-575 9 Arbutus MD   624H ONVOY SPECTRUM, LLC 238   2021-05-23   
443-576 A Randallstown MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-576 0 Randallstown MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-576 1 Randallstown MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-576 2 Randallstown MD   876D ONVOY, LLC - MD 238   2016-03-14   
443-576 3 Randallstown MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-576 4 Randallstown MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-576 5 Randallstown MD   876D ONVOY, LLC - MD 238   2016-03-14   
443-576 6 Randallstown MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-06-26   
443-576 8 Randallstown MD   515J IP HORIZON LLC 238   2016-01-04   
443-576 9 Randallstown MD   073H TELNYX LLC 238   2017-04-25   
443-577 A Glen Burnie MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-577 0 Glen Burnie MD   829J PAETEC ITEL, LLC 238      
443-577 1 Glen Burnie MD   829J PAETEC ITEL, LLC 238      
443-577 2 Glen Burnie MD   829J PAETEC ITEL, LLC 238      
443-577 3 Glen Burnie MD   829J PAETEC ITEL, LLC 238      
443-577 4 Glen Burnie MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-02-20   
443-577 5 Glen Burnie MD   829J PAETEC ITEL, LLC 238   2005-01-08   
443-577 6 Glen Burnie MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-11-24   
443-577 7 Glen Burnie MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-577 8 Glen Burnie MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-07-14   
443-577 9 Glen Burnie MD   829J PAETEC ITEL, LLC 238      
443-578 A Cockeysville MD BLTMMDSNDS5  4773 XO MARYLAND, LLC 238      
443-578 0 Cockeysville MD   4773 XO MARYLAND, LLC 238      
443-578 1 Cockeysville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2014-10-21   
443-578 2 Cockeysville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2015-10-26   
443-578 3 Cockeysville MD   876D ONVOY, LLC - MD 238   2012-02-27   
443-578 4 Cockeysville MD   4773 XO MARYLAND, LLC 238      
443-578 5 Cockeysville MD   4773 XO MARYLAND, LLC 238      
443-578 6 Cockeysville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2013-08-15   
443-578 7 Cockeysville MD   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-578 8 Cockeysville MD   829J PAETEC ITEL, LLC 238   2008-09-26   
443-578 9 Cockeysville MD   515J IP HORIZON LLC 238   2015-03-23   
443-579 A Essex MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-579 0 Essex MD   829J PAETEC ITEL, LLC 238      
443-579 1 Essex MD   829J PAETEC ITEL, LLC 238      

<< 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: Execulink Telecom

Like this site? We accept donations via PayPal.