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: 858

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-858 A Biggsville IL GLBGILXDXMD  495J STRATUS NETWORKS 977      
309-858 1 Biggsville IL GLBGILXDXMD  495J STRATUS NETWORKS 977   2021-04-04   
309-858 2 Biggsville IL MCMBILXDX9X  224C ONVOY, LLC 977   2021-07-05   
309-858 3 Biggsville IL MCMBILXDX5X  624H ONVOY SPECTRUM, LLC 977   2023-07-29   
309-858 4 Biggsville IL MCMBILXDZMD  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 977   2022-01-16   
309-858 6 Biggsville IL MCMBILXDHMD  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 977   2023-02-07   
309-858 7 Biggsville IL MCMBILXDX9X  224C ONVOY, LLC 977   2021-08-09   
309-858 8 Biggsville IL MCMBILXDX9X  224C ONVOY, LLC 977   2021-04-09   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.