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.

OCN: 281E YMAX COMMUNICATIONS CORP. - MD

1 2 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
240-200 6 Washington Zone 2 MD WASLDCRGDS0  236   2010-12-03   
240-200 7 Washington Zone 2 MD WASLDCRGDS0  236   2010-12-03   
240-200 8 Washington Zone 2 MD WASLDCRGDS0  236   2010-12-03   
240-200 9 Washington Zone 2 MD WASLDCRGDS0  236   2010-12-03   
240-324 A Ashton (Baltimore LATA) MD BLTMMDSNDS6  238      
240-324 0 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2008-11-22   
240-324 1 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2008-11-22   
240-324 2 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2008-11-22   
240-324 3 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2009-07-23   
240-324 4 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2009-07-23   
240-324 5 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2009-07-23   
240-330 6 Washington Zone 2 MD WASLDCRGDS0  236   2008-10-10   
240-345 5 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2007-08-20   
240-345 6 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2008-04-16   
240-345 7 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2008-06-16   
240-345 8 Ashton (Baltimore LATA) MD BLTMMDSNDS6  238   2008-06-16   
240-347 6 Hagerstown MD FRDRMDLH7MD  240   2009-04-10   
240-347 7 Hagerstown MD FRDRMDLH7MD  240   2009-04-10   
240-347 8 Hagerstown MD FRDRMDLH7MD  240   2009-04-10   
240-347 9 Hagerstown MD FRDRMDLH7MD  240   2009-04-10   
240-356 5 Myersville MD FRDRMDLH7MD  240   2009-03-16   
240-356 6 Myersville MD FRDRMDLH7MD  240   2009-03-16   
240-383 4 Washington Zone 2 MD WASLDCRGDS0  236   2008-10-10   
240-385 3 Myersville MD FRDRMDLH7MD  240   2009-03-16   
240-415 A Frederick MD FRDRMDLH7MD  240      
240-415 0 Frederick MD FRDRMDLH7MD  240   2009-01-30   
240-415 1 Frederick MD FRDRMDLH7MD  240   2009-01-30   
240-415 2 Frederick MD FRDRMDLH7MD  240   2009-01-30   
240-415 3 Frederick MD FRDRMDLH7MD  240   2009-01-30   
240-415 4 Frederick MD FRDRMDLH7MD  240   2009-01-30   
240-442 3 Oakland MD FRDRMDLH7MD  240   2009-03-16   
240-442 6 Oakland MD FRDRMDLH7MD  240   2009-03-16   
240-469 3 Hagerstown MD FRDRMDLH7MD  240   2009-03-13   
240-479 3 Washington Zone 2 MD WASLDCRGDS0  236   2008-10-10   
240-582 1 Washington Zone 4 MD WASLDCRGDS0  236   2008-10-10   
240-627 7 Washington Zone 11 MD WASLDCRGDS0  236   2008-08-31   
240-627 8 Washington Zone 11 MD WASLDCRGDS0  236   2008-08-31   
240-654 5 Gaithersburg MD WASLDCRGDS0  236   2009-07-24   
240-654 6 Gaithersburg MD WASLDCRGDS0  236   2009-07-24   
240-654 8 Gaithersburg MD WASLDCRGDS0  236   2008-08-08   
240-654 9 Gaithersburg MD WASLDCRGDS0  236   2008-08-08   
240-686 8 Gaithersburg MD WASLDCRGDS0  236   2007-07-28   
240-706 8 Washington Zone 3 MD WASLDCRGDS0  236   2010-11-30   
240-706 9 Washington Zone 3 MD WASLDCRGDS0  236   2010-11-30   
240-720 5 Gaithersburg MD WASLDCRGDS0  236   2008-04-16   
240-765 7 Washington Zone 5 MD WASLDCRGDS0  236   2008-10-10   
240-880 7 Washington Zone 11 MD WASLDCRGDS0  236   2008-08-31   
240-880 8 Washington Zone 11 MD WASLDCRGDS0  236   2008-08-31   
240-920 3 Cumberland MD FRDRMDLH7MD  240   2009-03-13   
240-920 5 Cumberland MD FRDRMDLH7MD  240   2009-03-13   
240-979 3 Cumberland MD FRDRMDLH7MD  240   2009-03-13   
240-979 5 Cumberland MD FRDRMDLH7MD  240   2009-03-13   
301-202 5 Washington Zone 2 MD WASLDCRGDS0  236   2010-06-08   
301-202 6 Washington Zone 2 MD WASLDCRGDS0  236   2010-06-08   
301-202 7 Washington Zone 2 MD WASLDCRGDS0  236   2010-01-15   
301-202 8 Washington Zone 2 MD WASLDCRGDS0  236   2010-01-15   
301-202 9 Washington Zone 2 MD WASLDCRGDS0  236   2010-01-15   
301-327 6 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2008-09-30   
301-327 7 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2007-08-20   
301-327 8 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2008-09-16   
301-327 9 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2008-03-15   
301-328 2 Washington Zone 3 MD WASLDCRGDS0  236   2008-10-10   
301-328 3 Washington Zone 3 MD WASLDCRGDS0  236   2008-10-10   
301-328 4 Washington Zone 3 MD WASLDCRGDS0  236   2008-10-10   
301-328 9 Washington Zone 3 MD WASLDCRGDS0  236   2008-10-10   
301-355 9 Gaithersburg MD WASLDCRGDS0  236   2011-02-02   
301-375 5 Indian Head MD WASLDCRGDS0  236   2009-09-25   
301-433 4 Washington Zone 5 MD WASLDCRGDS0  236   2008-10-10   
301-458 7 Washington Zone 4 MD WASLDCRGDS0  236   2008-10-10   
301-494 4 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2011-03-11   
301-494 5 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2011-06-17   
301-494 7 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2011-06-17   
301-533 8 Oakland MD FRDRMDLH7MD  240   2009-03-16   
301-534 A Indian Head MD WASLDCRGDS0  236      
301-534 0 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 1 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 2 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 3 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 4 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 5 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 6 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 7 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 8 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-534 9 Indian Head MD WASLDCRGDS0  236   2007-01-06   
301-569 8 Gaithersburg MD WASLDCRGDS0  236   2011-09-02   
301-618 9 Washington Zone 4 MD WASLDCRGDS0  236   2008-10-10   
301-684 1 Indian Head MD WASLDCRGDS0  236   2009-09-25   
301-684 3 Indian Head MD WASLDCRGDS0  236   2009-09-25   
301-684 7 Indian Head MD WASLDCRGDS0  236   2009-09-25   
301-740 6 Gaithersburg MD WASLDCRGDS0  236   2011-09-02   
301-778 3 Washington Zone 5 MD WASLDCRGDS0  236   2008-10-10   
301-812 6 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2013-11-26   
301-812 7 Washington Zone 15 (Baltimore LATA) MD BLTMMDSNDS6  238   2010-10-04   
301-836 5 Washington Zone 5 MD WASLDCRGDS0  236   2010-09-02   
301-836 6 Washington Zone 5 MD WASLDCRGDS0  236   2010-09-02   
301-892 7 Washington Zone 4 MD WASLDCRGDS0  236   2010-09-01   
301-892 8 Washington Zone 4 MD WASLDCRGDS0  236   2010-09-01   
301-956 7 Gaithersburg MD WASLDCRGDS0  236   2011-03-15   
301-956 8 Gaithersburg MD WASLDCRGDS0  236   2011-03-15   
301-968 7 Washington Zone 2 MD WASLDCRGDS0  236   2010-09-01   

1 2 >>

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.