Local Calling Guide

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Search area code/prefix (NPA/NXX)
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Sierra Madre, CA

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
626-921 1   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
626-921 2   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2012-02-13   
626-921 3   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2018-12-09   
626-921 4   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2004-01-13   
626-921 5   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2005-04-03   
626-921 6   981E BANDWIDTH.COM CLEC, LLC - CA 730   2009-01-14   
626-921 8   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      
626-921 9   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730      

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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