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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Switch: OKBRILOADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
630-218 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-368 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-472 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-537 A Hinsdale IL 9329 ILLINOIS BELL TEL CO 358      
630-571 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-572 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-573 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-574 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-575 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-586 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-623 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-645 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-684 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-706 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-722 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-928 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-954 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      
630-990 A Oak Brook IL 9329 ILLINOIS BELL TEL CO 358      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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