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: 273

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-273 A Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-273 0 Lemont IL CHCGILWUKMD  939H COMMIO, LLC 358      
331-273 1 Lemont IL CHCGILWUKMD  939H COMMIO, LLC 358      
331-273 2 Lemont IL CHCGILWUKMD  939H COMMIO, LLC 358      
331-273 3 Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-273 4 Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-273 5 Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-273 6 Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-273 7 Lemont IL CHCGILWUKMD  939H COMMIO, LLC 358      
331-273 8 Lemont IL CHCGILWUKMD  939H COMMIO, LLC 358      
331-273 9 Lemont IL CHCGILWUDS4  063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.