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.
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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
810-216 4 Port Huron MI 817J TELNET WORLDWIDE, INC. 340   2013-08-09   
810-242 4 Port Huron MI 817J TELNET WORLDWIDE, INC. 340   2019-09-01   
810-344 3 Grand Blanc MI 817J TELNET WORLDWIDE, INC. 340   2005-09-04   
810-396 A Flint MI 817J TELNET WORLDWIDE, INC. 340      
810-398 A Lexington MI 817J TELNET WORLDWIDE, INC. 340      
810-400 A Marine City MI 817J TELNET WORLDWIDE, INC. 340      
810-428 2 Grand Blanc MI 817J TELNET WORLDWIDE, INC. 340   2017-12-11   
810-448 A Dryden MI 817J TELNET WORLDWIDE, INC. 340      
810-452 A Lapeer MI 817J TELNET WORLDWIDE, INC. 340      
810-455 4 Port Huron MI 817J TELNET WORLDWIDE, INC. 340      
810-458 2 Linden MI 817J TELNET WORLDWIDE, INC. 340   2005-09-04   
810-483 A Yale MI 817J TELNET WORLDWIDE, INC. 340      
810-488 8 Port Huron MI 817J TELNET WORLDWIDE, INC. 340   2005-09-04   
810-539 A Deckerville MI 817J TELNET WORLDWIDE, INC. 340      
810-544 1 Carsonville MI 817J TELNET WORLDWIDE, INC. 340   2005-09-04   
810-561 A St Clair MI 817J TELNET WORLDWIDE, INC. 340      
810-583 A Sandusky MI 817J TELNET WORLDWIDE, INC. 340      
810-616 A Fenton MI 817J TELNET WORLDWIDE, INC. 340      
810-630 5 Swartz Creek MI 817J TELNET WORLDWIDE, INC. 340   2005-09-03   
810-673 2 Almont MI 817J TELNET WORLDWIDE, INC. 340   2005-09-03   
810-676 1 Marine City MI 817J TELNET WORLDWIDE, INC. 340      
810-678 1 Metamora MI 817J TELNET WORLDWIDE, INC. 340   2005-09-04   
810-683 1 Imlay City MI 817J TELNET WORLDWIDE, INC. 340   2005-09-04   
810-729 A Capac MI 817J TELNET WORLDWIDE, INC. 340      
810-800 A Hartland MI 817J TELNET WORLDWIDE, INC. 340      
810-828 A Davison MI 817J TELNET WORLDWIDE, INC. 340      
810-857 A Algonac MI 817J TELNET WORLDWIDE, INC. 340      
810-900 A Brighton MI 817J TELNET WORLDWIDE, INC. 340      
810-937 4 Port Huron MI 817J TELNET WORLDWIDE, INC. 340   2019-09-01   
810-988 A Montrose MI 817J TELNET WORLDWIDE, INC. 340      
947-570 A Milford-White Lake MI 817J TELNET WORLDWIDE, INC. 340      
989-849 A Gaines MI 817J TELNET WORLDWIDE, INC. 340      

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Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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