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: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
640-257 A Tuckerton NJ PSVLNJPLXRX  637C ONVOY, LLC - NJ 220   2024-04-21   
640-257 0 Tuckerton NJ PSVLNJPLXRX  637C ONVOY, LLC - NJ 220   2024-04-21   
640-257 1 Tuckerton NJ PSVLNJPLXRX  637C ONVOY, LLC - NJ 220   2024-04-21   
640-257 2 Tuckerton NJ PSVLNJPLXPZ  490J BOOST SUBSCRIBERCO L.L.C. 220   2026-01-02   
640-257 8 Tuckerton NJ PSVLNJPLXRX  637C ONVOY, LLC - NJ 220   2024-05-20   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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