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: WASHMOBERS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
636-221 A Washington MO 9533 SOUTHWESTERN BELL 520      
636-221 3 Washington MO 9533 SOUTHWESTERN BELL 520      
636-239 A Washington MO 9533 SOUTHWESTERN BELL 520      
636-390 A Washington MO 9533 SOUTHWESTERN BELL 520      
636-392 3 Washington MO 9533 SOUTHWESTERN BELL 520   2010-06-25   
636-432 A Washington MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-432 0 Washington MCA5 MO 9533 SOUTHWESTERN BELL 520   2006-03-03   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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