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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NPA: 640 [Rate centres in NPA 640] [Dial plan for NPA 640]

NXX: 283

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
640-283 A Hightstown NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2025-02-03   
640-283 0 Hightstown NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2025-02-03   
640-283 1 Hightstown NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2025-02-03   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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