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
443-214 9 Annapolis MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-02-23   
443-215 A Chestertown MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-216 A Dundalk MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-216 0 Dundalk MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
443-216 1 Dundalk MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-06-26   
443-216 2 Dundalk MD   829J PAETEC ITEL, LLC 238   2001-11-02   
443-216 3 Dundalk MD   829J PAETEC ITEL, LLC 238   2001-11-02   
443-216 4 Dundalk MD   829J PAETEC ITEL, LLC 238   2001-11-02   
443-216 5 Dundalk MD   829J PAETEC ITEL, LLC 238   2001-11-02   
443-216 6 Dundalk MD   829J PAETEC ITEL, LLC 238   2001-11-02   
443-216 7 Dundalk MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-216 8 Dundalk MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-07-13   
443-216 9 Dundalk MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-06-26   
443-217 A Annapolis MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-218 A Worthington MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-218 0 Worthington MD   145J TERRA NOVA TELECOM INC. 238   2024-11-11   
443-218 2 Worthington MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-03-05   
443-218 3 Worthington MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-04   
443-218 5 Worthington MD   073H TELNYX LLC 238   2023-08-12   
443-218 6 Worthington MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-10-28   
443-218 7 Worthington MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2011-11-20   
443-218 8 Worthington MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2006-08-07   
443-218 9 Worthington MD   876D ONVOY, LLC - MD 238   2020-04-30   
443-219 A Parkville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-219 0 Parkville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-219 1 Parkville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-219 2 Parkville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-01-13   
443-219 3 Parkville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-10   
443-219 4 Parkville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-02-20   
443-219 5 Parkville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2012-03-10   
443-219 6 Parkville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2012-10-12   
443-219 7 Parkville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2013-04-22   
443-219 8 Parkville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2013-04-22   
443-219 9 Parkville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-220 A Baltimore MD BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
443-220 0 Baltimore MD   9212 VERIZON MARYLAND, INC. 238      
443-220 1 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2004-01-12   
443-220 2 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-08-13   
443-220 3 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-08-13   
443-220 4 Baltimore MD   5562 METROPCS, INC. 238   2003-08-17   
443-220 5 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2003-08-17   
443-220 6 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2003-08-17   
443-220 7 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2004-01-12   
443-220 8 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2004-01-12   
443-220 9 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2004-01-12   
443-221 A Annapolis MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-221 0 Annapolis MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-05-12   
443-221 1 Annapolis MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-05-12   
443-221 2 Annapolis MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2010-08-01   
443-221 3 Annapolis MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2009-05-12   

<< 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.