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.

Hillsboro MCA5, MO

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
636-797 A HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      
636-797 1 HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      
636-797 2 HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      
636-797 3 HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      
636-797 4 HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      
636-797 5 HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      
636-797 6 HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      
636-797 7 WNVLMOXAXBX  508J CENTURYLINK COMMUNICATIONS, LLC 520   2014-07-22   
636-797 8   792K CHARTER IP ENABLED SERVICES, LLC 520   2006-06-15   
636-797 9 HLBOMO66RS1  9533 SOUTHWESTERN BELL 520      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.