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: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX: 624

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-624 A Chicago Zone 01-Canal IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-624 0 Chicago Zone 01-Canal IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-624 1 Chicago Zone 01-Canal IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-624 2 Chicago Zone 01-Canal IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-624 3 Chicago Zone 01-Canal IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-624 4 Chicago Zone 01-Canal IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-624 5 Chicago Zone 01-Canal IL CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-624 6 Chicago Zone 01-Canal IL BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-624 7 Chicago Zone 01-Canal IL BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-624 8 Chicago Zone 01-Canal IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358      
312-624 9 Chicago Zone 01-Canal IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.