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: 740 [Rate centres in NPA 740] [Dial plan for NPA 740]

NXX: 556

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
740-556 A Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324      
740-556 0 Baltimore OH CLMBOHLT1MD  464C ONVOY, LLC - OH 324   2023-07-30   
740-556 1 Baltimore OH CLMBOHLT1MD  464C ONVOY, LLC - OH 324   2023-07-30   
740-556 2 Baltimore OH CLMBOHLT1MD  464C ONVOY, LLC - OH 324   2023-07-30   
740-556 3 Baltimore OH CLMBOHLT1MD  464C ONVOY, LLC - OH 324   2023-07-30   
740-556 4 Baltimore OH CLMBOHLT1MD  464C ONVOY, LLC - OH 324   2023-10-27   
740-556 5 Baltimore OH CLMBOHLT1MD  464C ONVOY, LLC - OH 324   2023-10-27   
740-556 6 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2023-10-21   
740-556 7 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2023-09-18   
740-556 8 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2023-02-09   
740-556 9 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2022-10-10   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.