Local Calling Guide

Area code/prefix search

Search by area code/prefix (NPA/NXX) or OCN

  • 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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Last updated: Wed, 12 Jun 2013 23:24:04 UTC

How to use this page

NPA: 541 [Rate centres in NPA 541] [Dial plan for NPA 541]

NXX: 374

NPA-NXX-X Rate Centre Region Switch OCN LATA Eff date Disc date Map
541-374 Cascade Locks OR 4520 UNITED TELEPHONE-NORTHWEST-OR DBA CENTURYLINK - OR [link] 672 map


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