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: 410 [Rate centres in NPA 410] [Dial plan for NPA 410]

NXX: 275

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
410-275 A Cecilton MD CCTNMDCLRS0  9212 VERIZON MARYLAND, INC. 242      
410-275 0 Cecilton MD   876D ONVOY, LLC - MD 242   2017-04-13   
410-275 1 Cecilton MD   9212 VERIZON MARYLAND, INC. 242      
410-275 2 Cecilton MD   9212 VERIZON MARYLAND, INC. 242      
410-275 3 Cecilton MD   073H TELNYX LLC 242   2017-09-13   
410-275 4 Cecilton MD   318J COMCAST IP PHONE, LLC 242   2014-05-12   
410-275 5 Cecilton MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2004-04-03   
410-275 6 Cecilton MD   829J PAETEC ITEL, LLC 242   2014-11-08   
410-275 7 Cecilton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 242   2014-10-20   
410-275 8 Cecilton MD   9212 VERIZON MARYLAND, INC. 242      
410-275 9 Cecilton MD   9212 VERIZON MARYLAND, INC. 242      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.