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.

Milford, UT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
435-209 A SLKCUTJC4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 660      
435-209 0 SLKCUTJC4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 660   2005-01-24   
435-209 1   145J TERRA NOVA TELECOM INC. 660   2025-07-10   
435-209 7 SLKCUTJC4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 660   2018-12-22   
435-209 8 SLKCUTJC4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 660   2018-12-22   
435-209 9 SLKCUTJC4MD  6010 NEW CINGULAR WIRELESS PCS, LLC 660   2016-11-27   
435-387 A PNGTUTXCDS1  2286 SOUTH CENTRAL UTAH TEL. ASSN., INC. 660      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.