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: 622

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
810-622 A Port Sanilac MI PTSNMIMNRSA  9323 MICHIGAN BELL TEL CO 340      
810-622 0 Port Sanilac MI   9323 MICHIGAN BELL TEL CO 340      
810-622 6 Port Sanilac MI   516J TON80 COMMUNICATIONS, LLC 340   2022-04-05   
810-622 7 Port Sanilac MI   046L CLEAR RATE COMMUNICATIONS, LLC 340   2010-06-12   
810-622 8 Port Sanilac MI   9323 MICHIGAN BELL TEL CO 340      
810-622 9 Port Sanilac MI   9323 MICHIGAN BELL TEL CO 340      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.