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: CHCGILFRDS1

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-214 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-223 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-244 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-244 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-244 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-244 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-244 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-309 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-338 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-384 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-394 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-409 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-409 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-409 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-424 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-458 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-574 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-574 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      

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Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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