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: CRDLILAB6MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
618-621 4 Cairo IL 516C AT&T CORP. 362   2025-10-06   
618-649 3 Mounds IL 516C AT&T CORP. 362   2025-10-06   
618-712 3 Thebes IL 516C AT&T CORP. 362   2025-10-06   
618-742 5 Mound City IL 516C AT&T CORP. 362   2025-10-06   
618-747 5 Tamms IL 516C AT&T CORP. 362   2025-10-06   
730-275 A Olive Branch IL 516C AT&T CORP. 362   2025-08-22   
730-275 7 Olive Branch IL 516C AT&T CORP. 362   2025-08-22   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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