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: 831 [Rate centres in NPA 831] [Dial plan for NPA 831]

NXX: 627

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
831-627 A San Ardo CA SNARCA11RS1  9740 PACIFIC BELL 736      
831-627 1 San Ardo CA   9740 PACIFIC BELL 736      
831-627 2 San Ardo CA   9740 PACIFIC BELL 736      
831-627 3 San Ardo CA   9740 PACIFIC BELL 736      
831-627 4 San Ardo CA   516C AT&T CORP. 736   2011-09-26   
831-627 5 San Ardo CA   9262 UTILITY TELECOM GROUP, LLC - CA 736   2006-06-14   
831-627 6 San Ardo CA   649C ONVOY, LLC - CA 736   2017-04-27   
831-627 7 San Ardo CA   508J CENTURYLINK COMMUNICATIONS, LLC 736   2015-11-09   
831-627 8 San Ardo CA   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 736   2016-03-20   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.