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: HGRGMO57RS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
636-375 A High Ridge MO 9533 SOUTHWESTERN BELL 520      
636-375 3 High Ridge MO 9533 SOUTHWESTERN BELL 520      
636-375 5 High Ridge MO 9533 SOUTHWESTERN BELL 520      
636-671 A High Ridge MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-671 0 High Ridge MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-671 1 High Ridge MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-671 3 High Ridge MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-671 6 High Ridge MCA4 MO 9533 SOUTHWESTERN BELL 520      
636-671 8 High Ridge MCA4 MO 9533 SOUTHWESTERN BELL 520      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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