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: 641 [Rate centres in NPA 641] [Dial plan for NPA 641]

NXX: 810

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
641-810 A Oskaloosa IA   515J IP HORIZON LLC 632   2025-10-24   
641-810 0 Oskaloosa IA   145J TERRA NOVA TELECOM INC. 632   2025-11-06   
641-810 1 Oskaloosa IA   515J IP HORIZON LLC 632   2025-10-24   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.