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: DMSCMDDERP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-253 A Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-368 A Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-368 1 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-368 3 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-368 9 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-391 A Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-391 6 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-414 A Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-414 0 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-414 2 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-414 7 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-414 9 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-482 A Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-482 0 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-482 1 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-482 2 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-482 3 Damascus MD 9212 VERIZON MARYLAND, INC. 236      
301-482 6 Damascus MD 9212 VERIZON MARYLAND, INC. 236      

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

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