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: PITBPAOKCMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
412-550 1 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-550 2 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-550 8 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-550 9 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-694 A Pittsburgh Zone 1 PA 551G NUSO, LLC 234      
412-694 1 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2012-12-20   
412-785 8 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-785 9 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-909 0 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-909 1 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-909 2 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-909 3 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2018-11-07   
412-933 1 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2016-09-08   
412-933 2 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2016-09-08   
412-933 3 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2016-09-08   
412-933 4 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2016-09-08   
412-933 5 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2016-09-08   
878-999 0 Pittsburgh Zone 1 PA 551G NUSO, LLC 234   2016-03-19   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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