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: 321J HD CARRIER LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
619-505 8 National City CA SNDGCA0261Z  732   2016-06-09   
619-731 5 National City CA SNDGCA0261Z  732   2016-08-26   
619-731 6 National City CA SNDGCA0261Z  732   2016-08-26   
620-477 A Humboldt KS WCHTKSTPYMD  532      
620-477 9 Humboldt KS WCHTKSTPYMD  532   2021-07-23   
626-317 A Arcadia CA LSANCARCY1X  730      
626-317 1 Arcadia CA LSANCARCY1X  730   2016-06-02   
626-317 2 Arcadia CA LSANCARCY1X  730   2016-06-02   
626-317 3 Arcadia CA LSANCARCY1X  730   2016-06-02   
626-317 4 Arcadia CA LSANCARCY1X  730   2016-06-02   
626-829 5 Arcadia CA   730   2016-08-26   
626-829 6 Arcadia CA LSANCARCY1X  730   2016-08-26   
626-829 7 Arcadia CA LSANCARCY1X  730   2016-08-26   
628-629 A San Francisco: Central DA CA SNFCCA21XOZ  722      
628-629 9 San Francisco: Central DA CA SNFCCA21XOZ  722   2019-02-09   
628-726 A San Francisco: Central DA CA SNFCCA21XSZ  722   2024-08-23   
628-726 8 San Francisco: Central DA CA SNFCCA21XSZ  722   2024-08-23   
628-726 9 San Francisco: Central DA CA SNFCCA21XSZ  722   2024-08-23   
629-240 A Nashville TN NSVNTNGN7MD  470      
629-240 9 Nashville TN NSVNTNGN7MD  470   2020-08-08   
629-261 A Murfreesboro TN NSVNTNGN8MD  470      
629-261 9 Murfreesboro TN NSVNTNGN8MD  470   2021-12-10   
630-763 3 Elmhurst IL   358   2025-10-10   
631-202 2 Ronkonkoma NY NYCMNY37UMD  132   2016-08-22   
631-202 3 Ronkonkoma NY NYCMNY37UMD  132   2016-08-22   
631-202 4 Ronkonkoma NY NYCMNY37UMD  132   2016-08-22   
631-202 5 Ronkonkoma NY NYCMNY37UMD  132   2016-08-22   
631-202 6 Ronkonkoma NY NYCMNY37UMD  132   2016-08-22   
631-250 0 St James NY   132   2014-08-01   
631-290 2 Babylon NY NYCMNY37UMD  132   2016-08-22   
631-290 3 Babylon NY NYCMNY37UMD  132   2016-08-22   
631-290 4 Babylon NY NYCMNY37UMD  132   2016-08-22   
631-290 5 Babylon NY NYCMNY37UMD  132   2016-08-22   
631-307 3 Patchogue NY NYCMNY37UMD  132   2014-08-01   
631-315 4 Mattituck NY NYCMNY37UMD  132   2014-08-01   
631-326 3 Commack NY   132   2014-08-01   
631-341 5 Yaphank NY NYCMNY37UMD  132   2014-08-02   
631-350 3 Huntington NY   132   2014-08-01   
631-364 4 Stony Brook NY NYCMNY37UMD  132   2014-08-01   
631-483 9 Montauk Point NY NYCMNY37UMD  132   2014-08-01   
631-500 3 Water Mill NY   132   2014-08-01   
631-518 5 Bay Shore NY NYCMNY37UMD  132   2014-08-01   
631-526 5 Babylon NY NYCMNY37UMD  132   2016-08-22   
631-538 3 Selden NY NYCMNY37UMD  132   2014-08-01   
631-542 4 Ronkonkoma NY NYCMNY37UMD  132   2014-08-01   
631-568 A Amityville NY NYCMNY37UMD  132      
631-568 5 Amityville NY NYCMNY37UMD  132   2014-07-31   
631-573 5 Sayville NY NYCMNY37UMD  132   2014-08-01   
631-599 5 Riverhead NY   132   2014-08-01   
631-620 6 Babylon NY NYCMNY37UMD  132   2014-08-01   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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