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
443-204 5 Pikesville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2007-01-25   
443-204 6 Pikesville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-16   
443-204 7 Pikesville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2007-01-25   
443-204 8 Pikesville MD   9212 VERIZON MARYLAND, INC. 238   2003-11-14   
443-204 9 Pikesville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-03-29   
443-205 A Cambridge MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-205 0 Cambridge MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2004-06-03   
443-205 1 Cambridge MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2013-09-16   
443-205 2 Cambridge MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2006-08-07   
443-205 3 Cambridge MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2005-07-22   
443-205 4 Cambridge MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2004-07-16   
443-205 5 Cambridge MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2004-03-18   
443-205 6 Cambridge MD   876D ONVOY, LLC - MD 242   2024-03-02   
443-205 7 Cambridge MD   876D ONVOY, LLC - MD 242   2024-04-04   
443-205 8 Cambridge MD   145J TERRA NOVA TELECOM INC. 242   2022-11-07   
443-205 9 Cambridge MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2007-05-03   
443-206 A Perryville MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 0 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 1 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 2 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 3 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 4 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 5 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 6 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-206 7 Perryville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-206 8 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-03-04   
443-206 9 Perryville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-207 A Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 0 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 1 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 2 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 3 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2011-03-03   
443-207 4 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2013-12-06   
443-207 5 Elkton MD   318J COMCAST IP PHONE, LLC 238   2012-02-07   
443-207 6 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-207 7 Elkton MD   5562 METROPCS, INC. 238   2014-12-15   
443-207 8 Elkton MD   318J COMCAST IP PHONE, LLC 238   2012-03-09   
443-207 9 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238      
443-208 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-208 0 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 1 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 2 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 3 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 4 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 5 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 6 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 7 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 8 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-208 9 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-03-18   
443-209 A Havre de Grace MD   829J PAETEC ITEL, LLC 238   2025-04-01   

<< 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.