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.
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OCN: 321J HD CARRIER LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
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   
629-338 3 Nashville TN NSVNTNGN7MD  470   2026-03-20   
629-338 8 Nashville TN NSVNTNGN7MD  470   2026-03-20   
629-876 1 Nashville TN NSVNTNGN7MD  470   2026-03-20   
630-763 3 Elmhurst IL CHCGILWUVMD  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 NYCMNY37UMD  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 NYCMNY37UMD  132   2014-08-01   
631-341 5 Yaphank NY NYCMNY37UMD  132   2014-08-02   
631-350 3 Huntington NY NYCMNY37UMD  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 NYCMNY37UMD  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 NYCMNY37UMD  132   2014-08-01   
631-620 6 Babylon NY NYCMNY37UMD  132   2014-08-01   
631-633 3 Bellport NY NYCMNY37UMD  132   2014-08-01   
631-637 7 Brentwood NY NYCMNY37UMD  132   2014-08-01   
631-652 2 Smithtown NY NYCMNY37UMD  132   2014-08-01   
631-659 6 Cold Spring Harbor NY NYCMNY37UMD  132   2016-08-22   
631-659 7 Cold Spring Harbor NY NYCMNY37UMD  132   2016-08-22   
631-659 9 Cold Spring Harbor NY NYCMNY37UMD  132   2016-08-22   
631-674 5 Midland NY NYCMNY37UMD  132   2014-08-01   
631-743 3 Port Jefferson NY NYCMNY37UMD  132   2014-08-01   
631-763 0 Cold Spring Harbor NY NYCMNY37UMD  132   2016-08-22   
631-800 5 Southampton NY NYCMNY37UMD  132   2014-08-01   
631-832 2 Bayport NY NYCMNY37UMD  132   2014-08-01   
631-837 7 Northport NY NYCMNY37UMD  132   2014-08-01   
631-856 6 Hampton Bays NY NYCMNY37UMD  132   2014-08-01   
631-857 8 Cold Spring Harbor NY NYCMNY37UMD  132   2014-08-01   
631-858 4 West Commack NY NYCMNY37UMD  132   2014-08-01   
631-881 1 Central Islip NY NYCMNY37UMD  132   2014-08-01   

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Last updated: Tue, 29 Sep 2026 03:00:13 UTC

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