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: MRTNMONIRS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
573-643 A Marston MO 9533 SOUTHWESTERN BELL 520      
573-643 0 Marston MO 9533 SOUTHWESTERN BELL 520      
573-643 1 Marston MO 9533 SOUTHWESTERN BELL 520      
573-643 2 Marston MO 9533 SOUTHWESTERN BELL 520      
573-643 6 Marston MO 9533 SOUTHWESTERN BELL 520      

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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