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.

NPA: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 733

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-733 A Chesterfield MCA3 MO CHFDMO52DSA  9533 SOUTHWESTERN BELL 520      
636-733 0 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 1 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 2 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 3 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 4 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 5 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 6 Chesterfield MCA3 MO   993E BANDWIDTH.COM CLEC, LLC - MO 520   2014-05-24   
636-733 7 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 8 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      
636-733 9 Chesterfield MCA3 MO   9533 SOUTHWESTERN BELL 520      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.