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.

Switch: DESMIADTX5X

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
641-758 6 Marshalltown IA 8344 TELEPORT COMMUNICATIONS AMERICA, LLC - IA 632   2014-07-11   
641-819 6 Fairfield IA 8344 TELEPORT COMMUNICATIONS AMERICA, LLC - IA 632   2020-06-03   
641-840 8 Newton IA 8344 TELEPORT COMMUNICATIONS AMERICA, LLC - IA 632   2019-04-07   
641-871 6 Knoxville IA 8344 TELEPORT COMMUNICATIONS AMERICA, LLC - IA 632   2020-03-08   
641-888 9 Grinnell IA 8344 TELEPORT COMMUNICATIONS AMERICA, LLC - IA 632   2020-10-12   

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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