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: 326

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-326 A Downers Grove IL   224C ONVOY, LLC 358   2024-05-19   
331-326 0 Downers Grove IL   224C ONVOY, LLC 358   2024-05-19   
331-326 1 Downers Grove IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2024-05-21   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.