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: CLPKMDBWDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-624 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
240-684 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-220 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-286 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-313 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-344 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-345 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-397 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-441 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-446 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-474 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-486 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-488 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-489 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-507 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-513 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-614 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-901 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-982 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      
301-993 A Washington Zone 13 MD 9212 VERIZON MARYLAND, INC. 236      

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

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