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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OCN: 4417 FRONTIER COMMUNICATIONS OF MICHIGAN, INC.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
517-254 A Frontier MI FRNTMIXIRSA  346      
517-287 A North Adams MI NADMMIXIDS0  346      
517-296 A Montgomery MI MTGMMIXIRS0  346      
517-296 0 Montgomery MI   346      
517-296 1 Montgomery MI   346      
517-296 4 Montgomery MI   346      
517-296 9 Montgomery MI   346      
517-357 A Cambria MI CMBAMIXJRSA  346      
517-368 A Camden MI CMDNMIXIDS0  346      
517-383 A Prattville MI PRVLMIXJRSA  346      
517-467 A Onsted MI ONSTMIXIDS0  340      
517-467 0 Onsted MI   340      
517-467 2 Onsted MI   340      
517-467 3 Onsted MI   340      
517-467 4 Onsted MI   340      
517-467 6 Onsted MI   340      
517-467 7 Onsted MI   340      
517-467 8 Onsted MI   340      
517-467 9 Onsted MI   340      
517-523 A Osseo MI OSSEMIXIDS0  346      
517-524 A Concord MI CNCRMIXJDS0  346      
517-563 A Hanover MI HNVRMIXIDS0  346      
517-567 A Ransom MI RNSMMIXJRSA  346      
517-592 A Brooklyn MI BRKLMIXIDS0  346      
517-688 A Bundy Hill MI BNHLMIXIDS0  346      
517-869 A Allen MI ALLNMIXIDS0  346      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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