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.

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Switch Switch name Switch type
PLVLMDPVRS2  POOLESVILLE  RS 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-404 1 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236   2002-07-01   
240-404 2 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236   2002-07-01   
240-404 3 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236   2002-07-01   
240-404 4 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236   2002-07-01   
240-404 5 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236   2002-07-01   
240-686 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
240-686 0 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
240-686 1 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
240-686 2 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
240-686 3 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
240-686 4 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
240-686 7 Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
301-353 A Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-428 A Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-444 A Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-444 0 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-444 1 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-444 2 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-444 3 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-444 8 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-515 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
301-528 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
301-540 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
301-601 A Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-903 A Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-916 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
301-972 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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