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.

Washington Zone 2, 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 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-300 1 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 2 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 3 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 4 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 5 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 6 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 7 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 8 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-300 9 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2007-06-19   
301-312 A CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-312 0 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-23   
301-312 1 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-23   
301-312 2 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-23   
301-312 3 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-23   
301-312 4 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-23   
301-312 5 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-23   
301-312 6 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2006-09-18   
301-312 7 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-23   
301-312 8 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2006-09-18   
301-312 9 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 A CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 0 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 1 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 2 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 3 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 4 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 5 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 6 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 7 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 8 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-318 9 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-319 A BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-320 A BTHSMDWADS0  9212 VERIZON MARYLAND, INC. 236      
301-335 A CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 0 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 1 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 2 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 3 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 4 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 5 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 6 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 7 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 8 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-335 9 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-347 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-347 0 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-347 1 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-347 2 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-347 3 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-347 4 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      

<< 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 >>

Last updated: Tue, 29 Sep 2026 03:00:13 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.