Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 640 [Rate centres in NPA 640] [Dial plan for NPA 640]

NXX: 299

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
640-299 A Lawrenceville NJ   637C ONVOY, LLC - NJ 222   2026-03-20   
640-299 0 Lawrenceville NJ   637C ONVOY, LLC - NJ 222   2026-03-20   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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