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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Topmost, KY

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
606-447 A TPMSKYXA0MD  0419 THACKER/GRIGSBY TEL. CO. 466      

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

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