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.

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
973-314 7 Millburn NJ NWRKNJ0202Z  224   2016-05-19   
973-840 0 Caldwell NJ NWRKNJ0202Z  224   2016-09-04   
973-840 4 Caldwell NJ NWRKNJ0202Z  224   2016-09-04   
973-840 5 Caldwell NJ NWRKNJ0202Z  224   2016-09-04   
973-924 6 Millburn NJ NWRKNJ0202Z  224   2016-05-19   
973-924 7 Millburn NJ NWRKNJ0202Z  224   2016-05-19   

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Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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