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.

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

NXX: 244

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
640-244 A Lawrenceville NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2025-07-05   
640-244 4 Lawrenceville NJ   145J TERRA NOVA TELECOM INC. 222   2025-07-07   
640-244 7 Lawrenceville NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2025-07-05   
640-244 8 Lawrenceville NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2025-07-05   
640-244 9 Lawrenceville NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 222   2025-07-05   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.