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.

NPA: 712 [Rate centres in NPA 712] [Dial plan for NPA 712]

NXX: 740

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
712-740 A Sioux City IA   6570 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 630   2025-06-02   
712-740 0 Sioux City IA   6570 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 630   2025-06-02   
712-740 1 Sioux City IA   6570 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 630   2025-06-02   
712-740 2 Sioux City IA   6570 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 630   2025-06-02   
712-740 3 Sioux City IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 630   2025-07-04   
712-740 4 Sioux City IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 630   2025-07-04   
712-740 5 Sioux City IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 630   2025-07-04   
712-740 6 Sioux City IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 630   2025-07-04   
712-740 7 Sioux City IA   6570 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 630   2025-06-02   
712-740 8 Sioux City IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 630   2025-07-04   
712-740 9 Sioux City IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 630   2025-07-04   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.