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
650-416 A South San Francisco CA SNJSCAYB0MD  722      
650-416 2 South San Francisco CA   722      
650-416 3 South San Francisco CA   722      
650-416 5 South San Francisco CA   722      
650-416 7 South San Francisco CA   722      
650-417 A Mountain View CA SNJSCAYB0MD  722      
650-417 0 Mountain View CA   722      
650-417 2 Mountain View CA   722      
650-417 6 Mountain View CA   722      
650-417 7 Mountain View CA   722      
650-421 A Redwood City CA SNJSCAYB0MD  722      
650-421 2 Redwood City CA   722      
650-421 4 Redwood City CA   722      
650-421 7 Redwood City CA   722      
650-421 8 Redwood City CA   722      
650-421 9 Redwood City CA   722      
650-422 7 Palo Alto CA   722   2013-08-31   
650-426 6 Mountain View CA   722   2012-03-12   
650-433 2 Palo Alto CA   722   2012-01-12   
650-433 3 Palo Alto CA   722   2007-12-27   
650-434 A Woodside CA SNJSCAYB0MD  722      
650-434 9 Woodside CA   722      
650-443 A Millbrae CA SNJSCAYB0MD  722      
650-443 1 Millbrae CA   722      
650-443 2 Millbrae CA   722      
650-443 3 Millbrae CA   722      
650-443 4 Millbrae CA   722      
650-443 9 Millbrae CA   722      
650-450 5 Mountain View CA   722   2004-02-02   
650-458 2 San Mateo CA   722   2008-11-16   
650-471 A Los Altos CA SNJSCAYB0MD  722      
650-471 0 Los Altos CA   722      
650-479 A Half Moon Bay CA SNJSCAYB0MD  722      
650-479 9 Half Moon Bay CA   722      
650-487 A La Honda CA SNJSCAYB0MD  722      
650-487 9 La Honda CA   722      
650-503 A Redwood City CA SNJSCAYB0MD  722      
650-503 2 Redwood City CA   722      
650-503 5 Redwood City CA   722      
650-503 7 Redwood City CA   722      
650-516 A Pacifica CA SNJSCAYB0MD  722      
650-516 0 Pacifica CA   722      
650-516 9 Pacifica CA   722      
650-517 A San Carlos-Belmont CA SNJSCAYB0MD  722      
650-517 1 San Carlos-Belmont CA   722      
650-517 2 San Carlos-Belmont CA   722      
650-517 5 San Carlos-Belmont CA   722      
650-517 8 San Carlos-Belmont CA   722      
650-517 9 San Carlos-Belmont CA   722      
650-521 8 Palo Alto CA   722   2007-09-10   

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

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