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: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX: 291

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-291 A Downers Grove IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358      
331-291 0 Downers Grove IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2022-10-29   
331-291 1 Downers Grove IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2022-10-29   
331-291 2 Downers Grove IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2022-10-29   
331-291 3 Downers Grove IL RVDLILBDAMD  6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2023-07-12   
331-291 4 Downers Grove IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-08-02   
331-291 5 Downers Grove IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2022-10-30   
331-291 6 Downers Grove IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2022-10-30   
331-291 7 Downers Grove IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-08-02   
331-291 8 Downers Grove IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-08-02   
331-291 9 Downers Grove IL CHCGIL24DS6  224C ONVOY, LLC 358   2023-09-17   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.