Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

OCN: 671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
657-221 4 Orange CA   730   2013-05-23   
657-227 4 Westminster CA   730   2014-06-18   
657-227 5 Westminster CA   730   2015-03-22   
657-229 6 Santa Ana CA   730   2010-04-26   
657-229 7 Santa Ana CA   730   2010-04-26   
657-229 8 Santa Ana CA   730   2010-04-26   
657-232 6 Santa Ana CA   730   2013-12-29   
657-235 5 Santa Ana CA   730   2012-01-02   
657-261 4 Santa Ana CA   730   2014-12-29   
657-266 3 Santa Ana CA   730   2015-07-15   
657-267 3 Santa Ana CA   730   2017-03-10   
657-267 4 Santa Ana CA   730   2017-03-10   
657-274 7 Orange CA   730   2015-07-24   
657-341 7 Brea CA   730   2017-03-12   
657-605 A Orange CA IRVNCASM1MD  730      
657-605 7 Orange CA   730   2022-08-15   
657-605 8 Orange CA   730   2022-08-15   
657-622 4 Santa Ana CA   730   2009-11-27   
657-859 2 Santa Ana CA   730   2009-12-18   
657-859 5 Santa Ana CA   730   2009-12-24   
661-208 4 Palmdale: Palmdale DA CA   730   2008-05-04   
661-233 8 Palmdale: Palmdale DA CA   730   2008-05-04   
661-237 6 Shafter CA   734   2005-03-31   
661-241 5 Bakersfield: South DA CA   734   2005-06-18   
661-241 6 Bakersfield: South DA CA   734   2008-02-17   
661-241 7 Bakersfield: South DA CA   734   2008-02-17   
661-247 6 Arvin CA   734   2005-03-31   
661-341 3 Lancaster CA   730   2005-11-24   
661-347 7 Santa Clarita: Saugus Canyon Country DA CA   730   2008-11-17   
661-368 3 Bakersfield: North DA CA   734   2008-03-08   
661-371 2 Bakersfield: Main DA CA   734   2008-03-08   
661-371 3 Bakersfield: Main DA CA   734   2008-03-08   
661-377 A Bakersfield: Main DA CA BKFDCA12XRX  734      
661-377 0 Bakersfield: Main DA CA   734      
661-377 1 Bakersfield: Main DA CA   734      
661-377 2 Bakersfield: Main DA CA   734      
661-377 3 Bakersfield: Main DA CA   734      
661-377 7 Bakersfield: Main DA CA   734      
661-377 9 Bakersfield: Main DA CA   734      
661-381 A Bakersfield: South DA CA BKFDCA12XRX  734      
661-381 2 Bakersfield: South DA CA   734   2009-07-23   
661-390 A Arvin CA BKFDCA12XRX  734      
661-401 2 Bakersfield: Main DA CA   734   2011-08-28   
661-410 A Bakersfield: North DA CA BKFDCA12XRX  734      
661-410 0 Bakersfield: North DA CA   734      
661-410 1 Bakersfield: North DA CA   734      
661-410 2 Bakersfield: North DA CA   734   2014-05-11   
661-410 3 Bakersfield: North DA CA   734      
661-410 4 Bakersfield: North DA CA   734      
661-410 5 Bakersfield: North DA CA   734   2014-04-11   

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

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