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.

Washington, MI

<< 1 2

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
586-935 A   5562 METROPCS, INC. 340      
586-935 0   145J TERRA NOVA TELECOM INC. 340   2025-02-13   
586-935 1   2550 123.NET, LLC 340   2005-09-04   
586-935 2   5562 METROPCS, INC. 340   2006-01-30   
586-935 3   145J TERRA NOVA TELECOM INC. 340   2025-10-04   
586-935 4   2964 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 340   2025-01-04   
586-935 5   543C ONVOY, LLCV - MI 340   2021-03-09   
586-935 6   829J PAETEC ITEL, LLC 340   2004-03-03   
586-935 7   5562 METROPCS, INC. 340   2007-10-11   
586-935 8   5562 METROPCS, INC. 340   2007-10-11   
586-992 A WASHMIWADS0  9323 MICHIGAN BELL TEL CO 340      
586-992 0   9323 MICHIGAN BELL TEL CO 340      
586-992 1   9323 MICHIGAN BELL TEL CO 340      
586-992 2   9323 MICHIGAN BELL TEL CO 340      
586-992 3   9323 MICHIGAN BELL TEL CO 340      
586-992 4   829J PAETEC ITEL, LLC 340   2010-07-04   
586-992 5   991E BANDWIDTH.COM CLEC, LLC - MI 340   2020-12-05   
586-992 6   318J COMCAST IP PHONE, LLC 340   2014-08-01   
586-992 7   3535 ACD TELECOM, INC. - MI 340   2005-12-09   
586-992 8   9323 MICHIGAN BELL TEL CO 340      
586-992 9   9323 MICHIGAN BELL TEL CO 340      

<< 1 2

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.