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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: NWMDMOSHRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
573-748 A New Madrid MO 9533 SOUTHWESTERN BELL 520      
573-748 1 New Madrid MO 9533 SOUTHWESTERN BELL 520      
573-748 2 New Madrid MO 9533 SOUTHWESTERN BELL 520      
573-748 5 New Madrid MO 9533 SOUTHWESTERN BELL 520      
573-748 7 New Madrid MO 9533 SOUTHWESTERN BELL 520      

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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