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.
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Switch: SLSPMDSSDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-662 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-285 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-427 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-495 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-562 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-563 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-565 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-578 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-585 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-587 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-588 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-589 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-608 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-626 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-650 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-819 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      
301-930 A Washington Zone 3 MD 9212 VERIZON MARYLAND, INC. 236      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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