Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 840 [Rate centres in NPA 840] [Dial plan for NPA 840]

NXX: 997

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-997 A Claremont-San Dimas CA   649C ONVOY, LLC - CA 730   2026-06-27   

Last updated: Sun, 17 May 2026 03:26:51 UTC

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