Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 661 [Rate centres in NPA 661] [Dial plan for NPA 661]

NXX: 991

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-991 A Palmdale: Palmdale DA CA   649C ONVOY, LLC - CA 730   2026-07-23   
661-991 0 Palmdale: Palmdale DA CA   649C ONVOY, LLC - CA 730   2026-07-23   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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