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
301-202 8 WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2010-01-15   
301-202 9 WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2010-01-15   
301-204 A CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-204 0 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-204 1 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-204 2 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-204 3 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-204 4 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-204 5 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-03-24   
301-204 6 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-03-24   
301-204 7 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-03-24   
301-204 8 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236   2003-08-11   
301-204 9 CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-03-24   
301-214 A BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-215 A CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-215 0 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2017-10-09   
301-215 1 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2018-10-14   
301-215 2 CHCHMDBEX4X  551G NUSO, LLC 236   2018-10-14   
301-215 3 CHCHMDBEX4X  551G NUSO, LLC 236   2018-10-14   
301-215 4 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-215 5 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-215 6 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-215 7 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-215 8 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-215 9 CHCHMDBEDS0  9212 VERIZON MARYLAND, INC. 236      
301-219 A CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-221 A CHCHMDBEWMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-222 A WASHDCSW01Z  829J PAETEC ITEL, LLC 236   2025-04-02   
301-222 0 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-222 1 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-222 2 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-222 3 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2005-12-10   
301-222 4 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-222 5 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-222 6 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-222 7 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2006-08-06   
301-222 8 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-222 9 WASHDCSW01Z  829J PAETEC ITEL, LLC 236      
301-224 A SLSPMDSSX6X  6630 SPOK, INC. 236      
301-227 A BTHSMDWADS0  9212 VERIZON MARYLAND, INC. 236      
301-229 A BTHSMDWADS0  9212 VERIZON MARYLAND, INC. 236      
301-243 A BTHSMDWADS0  9212 VERIZON MARYLAND, INC. 236      
301-243 0   9212 VERIZON MARYLAND, INC. 236   2006-08-19   
301-243 1   9212 VERIZON MARYLAND, INC. 236   2006-08-19   
301-243 2   9212 VERIZON MARYLAND, INC. 236   2006-08-19   
301-243 3   9212 VERIZON MARYLAND, INC. 236   2006-08-19   
301-243 4   9212 VERIZON MARYLAND, INC. 236   2006-08-19   
301-243 5   9212 VERIZON MARYLAND, INC. 236   2006-08-19   
301-243 6   9212 VERIZON MARYLAND, INC. 236   2006-08-19   
301-243 7   9212 VERIZON MARYLAND, INC. 236   2006-08-19   

<< 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: VoIP.ms

Like this site? We accept donations via PayPal.