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: 870

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-870 A Middletown MD CMLDMDCMEMD  876D ONVOY, LLC - MD 240      
240-870 0 Middletown MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240   2017-02-04   
240-870 1 Middletown MD   073H TELNYX LLC 240   2017-08-08   
240-870 2 Middletown MD   318J COMCAST IP PHONE, LLC 240   2017-05-23   
240-870 3 Middletown MD   876D ONVOY, LLC - MD 240   2024-04-05   
240-870 4 Middletown MD   145J TERRA NOVA TELECOM INC. 240   2023-11-14   
240-870 6 Middletown MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240   2018-09-20   
240-870 7 Middletown MD   508J CENTURYLINK COMMUNICATIONS, LLC 240   2016-11-05   
240-870 8 Middletown MD   876D ONVOY, LLC - MD 240   2016-11-03   
240-870 9 Middletown MD   876D ONVOY, LLC - MD 240   2016-11-03   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.