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: 9212 VERIZON MARYLAND, INC.

<< 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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
301-587 A Washington Zone 3 MD SLSPMDSSDS0  236    
301-588 A Washington Zone 3 MD SLSPMDSSDS0  236    
301-589 A Washington Zone 3 MD SLSPMDSSDS0  236    
301-590 A Washington Zone 10 MD GTBGMDGBPS0  236    
301-590 0 Washington Zone 10 MD   236    
301-590 1 Washington Zone 10 MD   236    
301-590 2 Washington Zone 10 MD   236    
301-590 3 Washington Zone 10 MD   236    
301-590 4 Washington Zone 10 MD   236    
301-590 6 Washington Zone 10 MD   236    
301-590 7 Washington Zone 10 MD   236    
301-590 8 Washington Zone 10 MD   236    
301-590 9 Washington Zone 10 MD   236    
301-592 A Washington Zone 3 MD SLSPMDNWDS0  236    
301-592 0 Washington Zone 3 MD   236    
301-592 1 Washington Zone 3 MD   236    
301-592 2 Washington Zone 3 MD   236    
301-592 3 Washington Zone 3 MD   236    
301-592 4 Washington Zone 3 MD   236    
301-592 5 Washington Zone 3 MD   236    
301-592 6 Washington Zone 3 MD   236    
301-592 8 Washington Zone 3 MD   236    
301-592 9 Washington Zone 3 MD   236    
301-593 A Washington Zone 3 MD SLSPMDNWDS0  236    
301-594 A Washington Zone 2 MD BTHSMDRPDS0  236    
301-595 A Washington Zone 13 MD BTVLMDBVDS0  236    
301-596 A Laurel (Baltimore LATA) MD CLMAMDCBDS0  238    
301-598 A Washington Zone 12 MD SLSPMDNBDS0  236    
301-599 A Washington Zone 5 MD CLTNMDCLDS0  236    
301-600 A Frederick MD FRDRMDFRDS1  240 2006-08-27   
301-600 0 Frederick MD   240 2006-08-27   
301-600 1 Frederick MD   240 2006-08-27   
301-600 2 Frederick MD   240 2006-08-27   
301-600 3 Frederick MD   240 2006-08-27   
301-600 4 Frederick MD   240 2006-08-27   
301-600 5 Frederick MD   240 2006-08-27   
301-600 6 Frederick MD   240 2006-08-27   
301-600 7 Frederick MD   240 2006-08-27   
301-600 8 Frederick MD   240 2006-08-27   
301-600 9 Frederick MD   240 2006-08-27   
301-601 A Washington Zone 10 MD GMTWMDGNDS0  236    
301-603 A Washington Zone 11 MD SLSPMDNBDS0  236    
301-603 0 Washington Zone 11 MD   236    
301-603 1 Washington Zone 11 MD   236    
301-603 7 Washington Zone 11 MD   236    
301-603 8 Washington Zone 11 MD   236    
301-603 9 Washington Zone 11 MD   236    
301-604 A Laurel MD LARLMDLRDS0  236    
301-605 A Washington Zone 10 MD PLVLMDPVRS2  236    
301-605 6 Washington Zone 10 MD   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 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 >>

Last updated: Sat, 01 Dec 2018 01:51:37 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.