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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

Block: A

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-301 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-302 A Crofton MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-303 A Aberdeen MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
443-304 A Arbutus MD   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-305 A Armiger-Gibson Island MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-306 A Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-307 A Bel Air MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-308 A Severn MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-309 A Elkton MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-310 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-312 A Brooklyn Park-Linthicum MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-313 A Fork MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-314 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-315 A Catonsville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-316 A Woodlawn MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-317 A Chase MD   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-318 A Cockeysville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-319 A Columbia MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-320 A Baltimore MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-321 A Annapolis MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-322 A Towson MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-323 A Sharptown MD   829J PAETEC ITEL, LLC 242   2025-04-01   
443-324 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-325 A Ellicott City MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-326 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-327 A Aberdeen MD   829J PAETEC ITEL, LLC 236   2025-04-01   
443-328 A Sykesville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-329 A Waterloo (Washington DC LATA) MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
443-330 A Cockeysville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-331 A Taneytown MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-332 A Crofton MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-333 A Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-334 A Pikesville MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-335 A Brooklyn Park-Linthicum MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-336 A Annapolis MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-337 A Sparrows Point MD BLTQMD01BMD  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-338 A Sparks-Glencoe MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-339 A Sherwood Forest MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-340 A Westminster MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-341 A Catonsville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-342 A Solomons MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-343 A Millersville MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-344 A Severna Park MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-345 A Aberdeen MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
443-346 A Severna Park MD BLTQMD01BMD  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-347 A Cardiff MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-348 A Woodlawn MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-349 A Silver Run MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-350 A Elkton MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-351 A Odenton MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-352 A Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-353 A Cockeysville MD CYVLMDDADS0  9212 VERIZON MARYLAND, INC. 238      
443-354 A Glen Burnie MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-355 A Ellicott City MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-356 A Bel Air MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-357 A Pikesville MD PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
443-358 A Salisbury MD SLBRMDSC9MD  281E YMAX COMMUNICATIONS CORP. - MD 242      
443-359 A Delmar MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-360 A Aberdeen MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 236      
443-361 A Sykesville MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-362 A Easton MD SLBRMDSCXMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242      
443-363 A Severn MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-364 A Ellicott City MD CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-365 A Salisbury MD SLBRMDSCXMD  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 242      
443-366 A Salisbury MD SLBRMDSCXMD  5562 METROPCS, INC. 242      
443-367 A Columbia MD CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
443-368 A Westminster MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-369 A Bel Air MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-370 A Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-371 A Bel Air MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-372 A Edgewood MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-373 A Ocean City MD SLBRMDSCXMD  5562 METROPCS, INC. 242      
443-374 A Aberdeen MD   829J PAETEC ITEL, LLC 236   2025-04-01   
443-375 A Hampstead MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-376 A Dundalk MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-377 A Towson MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-378 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-02-09   
443-379 A Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
443-380 A Woodlawn MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-381 A Reisterstown MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-382 A Cambridge MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-383 A Silver Run MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-384 A Parkville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-385 A Easton MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-386 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-387 A Pocomoke MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-388 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-389 A Salisbury MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-390 A Churchville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-391 A Cockeysville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2025-04-04   
443-392 A Baltimore MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-393 A Columbia MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-394 A Pikesville MD OWMLMDOMDS0  9212 VERIZON MARYLAND, INC. 238      
443-395 A Aberdeen MD ABRDMDABDS0  9212 VERIZON MARYLAND, INC. 236      
443-396 A Odenton MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-397 A Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242      
443-398 A Sykesville MD BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-399 A Dundalk MD   876D ONVOY, LLC - MD 238      
443-400 A Brooklyn Park-Linthicum MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-401 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      

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Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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