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.

Switch: GTBGMDGBPS0

Remotes:

Switch Switch name Switch type
CHCHMDBERP0  CHEVY CHASE  RP 
DMSCMDDERP0    RP 

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-975 2 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-975 3 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-975 4 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-975 5 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-975 6 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-975 8 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-975 9 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-977 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
301-978 A Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-978 2 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-978 4 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-978 5 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-978 8 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-978 9 Washington Zone 10 MD 9212 VERIZON MARYLAND, INC. 236      
301-987 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      
301-990 A Gaithersburg MD 9212 VERIZON MARYLAND, INC. 236      

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Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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