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: 221

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-221 A Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 0 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 1 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 2 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 3 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 4 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 5 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 6 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 7 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 8 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      
331-221 9 Elmhurst IL EMHRILETDS0  9329 ILLINOIS BELL TEL CO 358      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.