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.

Baltimore, MD

<< 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 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-291 3 BLTMMDCH1DD  9212 VERIZON MARYLAND, INC. 238      
410-291 4 BLTMMDCH1DD  9212 VERIZON MARYLAND, INC. 238      
410-291 5 BLTMMDCH1DD  9212 VERIZON MARYLAND, INC. 238      
410-291 6 CLMAMDJTBMD  2589 US LEC OF MARYLAND, INC. 238   2017-09-02   
410-291 7 BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2017-08-03   
410-291 8 BLTMMDCHDMD  551G NUSO, LLC 238   2017-06-07   
410-291 9   515J IP HORIZON LLC 238   2019-04-26   
410-299 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-301 A BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
410-301 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 2 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 3 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 4 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 6 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-301 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
410-303 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
410-318 A PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 0 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 1 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 2 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 3 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 4 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 5 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 6 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 7 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 8 PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-318 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2004-08-29   
410-319 A BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-319 0 BLTMMDCHAMD  1958 ATX TELECOMMUNICATIONS SERVICES, LTD. 238   2004-02-15   
410-319 1 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-319 2 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2019-02-02   
410-319 3 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-319 4   145J TERRA NOVA TELECOM INC. 238   2021-09-24   
410-319 5 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-319 6 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-319 7 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-319 8 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-319 9 BLTMMDHMDS0  9212 VERIZON MARYLAND, INC. 238      
410-323 A BLTMMDYKDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 A BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-10-02   
410-325 1 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 2 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 3 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 4 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 5 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 6 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 7 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 8 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-325 9 BLTMMDFRDS0  9212 VERIZON MARYLAND, INC. 238      
410-327 A BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-328 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-332 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-333 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-336 A CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-338 A BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 0 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 1 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 2 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 3 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 4 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 5 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 6 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 7 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 8 BLTMMDUVDS0  9212 VERIZON MARYLAND, INC. 238      
410-338 9   515J IP HORIZON LLC 238   2019-04-26   
410-340 A CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
410-342 A BLTMMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
410-347 A BLTMMDCHDS3  9212 VERIZON MARYLAND, INC. 238      
410-350 A BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-350 0 BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-350 1 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-12-31   
410-350 2 BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-350 3 BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-350 4 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-03-10   
410-350 5 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-03-10   
410-350 6 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-03-10   
410-350 7 BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-350 8 BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-350 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2003-12-31   
410-351 A HNVAMDAE3MD  6630 USA MOBILITY WIRELESS, INC. 238      
410-354 A BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-355 A BRKLMDBKRP0  9212 VERIZON MARYLAND, INC. 238      
410-358 A PIVLMDPKDS1  9212 VERIZON MARYLAND, INC. 238      
410-359 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 A BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-02-20   
410-361 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-02-20   
410-361 2 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 3 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 4 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 5 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 6 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 7 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 8 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238      
410-361 9 BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 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 >>

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.