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: 256

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
640-256 A Pemberton NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2024-04-21   
640-256 0 Pemberton NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2024-04-21   
640-256 1 Pemberton NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2024-04-21   
640-256 2 Pemberton NJ   637C ONVOY, LLC - NJ 222   2025-04-13   
640-256 3 Pemberton NJ   637C ONVOY, LLC - NJ 222   2026-03-15   
640-256 5 Pemberton NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2025-10-29   
640-256 6 Pemberton NJ CMDNNJCEXQY  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2024-12-08   
640-256 7 Pemberton NJ CMDNNJCEXFZ  264F PEERLESS NETWORK OF NEW JERSEY, LLC - NJ 222   2024-06-22   
640-256 8 Pemberton NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2024-05-20   
640-256 9 Pemberton NJ CMDNNJCECM2  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 222   2024-06-15   

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

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