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: 309 [Rate centres in NPA 309] [Dial plan for NPA 309]

NXX: 579

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-579 A Mossville IL MSVLILXDRS0  1015 FRONTIER NORTH, INC. - IL 368      
309-579 0 Mossville IL   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 368   2015-11-02   
309-579 1 Mossville IL   224C ONVOY, LLC 368   2019-07-15   
309-579 2 Mossville IL   1015 FRONTIER NORTH, INC. - IL 368      
309-579 3 Mossville IL   1015 FRONTIER NORTH, INC. - IL 368      
309-579 4 Mossville IL   7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 368   2016-07-29   
309-579 5 Mossville IL   318J COMCAST IP PHONE, LLC 368   2006-08-09   
309-579 6 Mossville IL   624H ONVOY SPECTRUM, LLC 368   2024-05-13   
309-579 8 Mossville IL   1015 FRONTIER NORTH, INC. - IL 368      
309-579 9 Mossville IL   224C ONVOY, LLC 368   2019-07-15   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.