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: HVTRMO67DSA

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
636-441 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-442 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-447 A Harvester MO 9533 SOUTHWESTERN BELL 520      
636-477 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-498 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-722 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-851 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-922 A Harvester MO 9533 SOUTHWESTERN BELL 520      
636-926 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-928 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-936 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-939 A Harvester MCA4 MO 9533 SOUTHWESTERN BELL 520      

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

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