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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Knoxville, MO

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
660-352 A TINAMOXADS0  1890 GREEN HILLS TEL. CORP. 524      
660-352 0   1890 GREEN HILLS TEL. CORP. 524      
660-352 1   1890 GREEN HILLS TEL. CORP. 524      
660-352 2   1890 GREEN HILLS TEL. CORP. 524      
660-352 3   793K TWC IP ENABLED SERVICES, LLC 524   2024-10-20   
660-352 6   1890 GREEN HILLS TEL. CORP. 524      
660-352 7   1890 GREEN HILLS TEL. CORP. 524      
660-352 8   1890 GREEN HILLS TEL. CORP. 524      
660-352 9   1890 GREEN HILLS TEL. CORP. 524      
660-588 A KSCYMO55X2Z  516J TON80 COMMUNICATIONS, LLC 524      
660-588 5   145J TERRA NOVA TELECOM INC. 524   2025-10-09   
660-588 8   516J TON80 COMMUNICATIONS, LLC 524   2022-04-24   

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

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