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: ARMSMOCRRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
660-273 A Armstrong MO 9533 SOUTHWESTERN BELL 524      
660-273 1 Armstrong MO 9533 SOUTHWESTERN BELL 524      
660-273 2 Armstrong MO 9533 SOUTHWESTERN BELL 524      
660-273 9 Armstrong MO 9533 SOUTHWESTERN BELL 524      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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