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.

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, 07 Dec 2025 22:02:11 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.