Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 909 [Rate centres in NPA 909] [Dial plan for NPA 909]

NXX: 974

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
909-974 A Ontario CA ONTRCAXMDS0  2319 FRONTIER CALIFORNIA INC. 730      
909-974 0 Ontario CA   2319 FRONTIER CALIFORNIA INC. 730      
909-974 1 Ontario CA   2319 FRONTIER CALIFORNIA INC. 730      
909-974 2 Ontario CA   2319 FRONTIER CALIFORNIA INC. 730      
909-974 3 Ontario CA   2319 FRONTIER CALIFORNIA INC. 730      
909-974 4 Ontario CA   2319 FRONTIER CALIFORNIA INC. 730      
909-974 5 Ontario CA   2319 FRONTIER CALIFORNIA INC. 730      
909-974 6 Ontario CA   2319 FRONTIER CALIFORNIA INC. 730      
909-974 7 Ontario CA   7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
909-974 8 Ontario CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-16   
909-974 9 Ontario CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2005-07-06   

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

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