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: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX: 642

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-642 A Elmhurst IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358      
331-642 0 Elmhurst IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2008-12-12   
331-642 1 Elmhurst IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-04-18   
331-642 2 Elmhurst IL   5562 METROPCS, INC. 358   2010-07-15   
331-642 3 Elmhurst IL   5562 METROPCS, INC. 358   2010-07-15   
331-642 4 Elmhurst IL   5562 METROPCS, INC. 358   2010-07-15   
331-642 5 Elmhurst IL   5562 METROPCS, INC. 358   2010-07-15   
331-642 6 Elmhurst IL   460K FIRST COMMUNICATIONS, LLC 358   2010-04-09   
331-642 7 Elmhurst IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-08-14   
331-642 8 Elmhurst IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-11-27   
331-642 9 Elmhurst IL   5562 METROPCS, INC. 358   2011-08-29   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.