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: SLSPMD91DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-220 A Poolesville MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-266 A Washington Zone 14 MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-269 A Washington Zone 16 MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-331 A Washington Zone 3 MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-414 A Washington Zone 6 MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-503 A Tompkinsville MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-539 A Washington Zone 4 MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-597 A Gaithersburg MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-641 A Washington Zone 3 MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-713 A Laurel MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-806 A Indian Head MD 568G PEERLESS NETWORK OF MARYLAND, LLC 236      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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