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.
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Monitor, OR

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
503-634 A MNTRORXA0MD  2384 MONITOR COOP. TEL. CO. 672      
971-305 A PTLDORPBGT0  794G TELTRUST CORPORATION - OR 672      
971-305 7 PTLDOR13XFX  318J COMCAST IP PHONE, LLC 672   2022-03-04   

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

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