Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX: 800

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-800 A West Chicago IL CHCGIL24DS6  224C ONVOY, LLC 358      
331-800 0 West Chicago IL   224C ONVOY, LLC 358   2017-11-26   
331-800 1 West Chicago IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2021-10-04   
331-800 2 West Chicago IL   224C ONVOY, LLC 358   2023-04-20   
331-800 3 West Chicago IL   224C ONVOY, LLC 358   2025-01-06   
331-800 4 West Chicago IL   224C ONVOY, LLC 358   2024-04-05   
331-800 5 West Chicago IL   224C ONVOY, LLC 358   2024-04-05   
331-800 6 West Chicago IL   624H ONVOY SPECTRUM, LLC 358   2021-11-26   
331-800 7 West Chicago IL   624H ONVOY SPECTRUM, LLC 358   2021-11-26   
331-800 8 West Chicago IL   224C ONVOY, LLC 358   2017-11-26   
331-800 9 West Chicago IL   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2021-10-01   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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