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: 810 [Rate centres in NPA 810] [Dial plan for NPA 810]

NXX: 657

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
810-657 A Carsonville MI CSVIMIMNRSA  9323 MICHIGAN BELL TEL CO 340      
810-657 0 Carsonville MI   543C ONVOY, LLCV - MI 340   2016-04-14   
810-657 1 Carsonville MI   543C ONVOY, LLCV - MI 340   2016-04-14   
810-657 2 Carsonville MI   318J COMCAST IP PHONE, LLC 340   2020-12-18   
810-657 3 Carsonville MI   543C ONVOY, LLCV - MI 340   2021-01-30   
810-657 4 Carsonville MI   516C AT&T CORP. 340   2011-05-31   
810-657 5 Carsonville MI   046L CLEAR RATE COMMUNICATIONS, LLC 340   2010-06-12   
810-657 7 Carsonville MI   829J PAETEC ITEL, LLC 340   2009-11-16   
810-657 8 Carsonville MI   145J TERRA NOVA TELECOM INC. 340   2025-04-09   
810-657 9 Carsonville MI   9323 MICHIGAN BELL TEL CO 340      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.