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: 240 [Rate centres in NPA 240] [Dial plan for NPA 240]

NXX: 282

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-282 A Mechanicsville MD WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-282 0 Mechanicsville MD WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-282 1 Mechanicsville MD   876D ONVOY, LLC - MD 236   2025-05-10   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.