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.

Pacific MCA5, MO

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
636-271 A PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 0 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 1 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 2 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 3 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 4 STLSMO05RMD  993E BANDWIDTH.COM CLEC, LLC - MO 520   2014-05-24   
636-271 5 STLSMO05RMD  993E BANDWIDTH.COM CLEC, LLC - MO 520   2015-09-20   
636-271 6 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 7 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 8 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      
636-271 9 PCFCMO61RS0  9533 SOUTHWESTERN BELL 520      

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.