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: 300

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-300 A Harvester MCA4 MO WDSPMO01DS0  9533 SOUTHWESTERN BELL 520      
636-300 0 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      
636-300 1 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      
636-300 2 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      
636-300 3 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      
636-300 4 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      
636-300 5 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      
636-300 6 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520   2011-01-07   
636-300 7 Harvester MCA4 MO   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 520   2009-10-28   
636-300 8 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      
636-300 9 Harvester MCA4 MO   9533 SOUTHWESTERN BELL 520      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.