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: 203 [Rate centres in NPA 203] [Dial plan for NPA 203]

NXX: 820

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-820 A Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 0 Norwalk CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2014-10-12   
203-820 1 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 2 Norwalk CT HRFRCT0377Z  350E YMAX COMMUNICATIONS CORP. - CT 920   2011-10-12   
203-820 3 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 4 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 5 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 6 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 7 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 8 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-820 9 Norwalk CT BLFDCTAP2MD  5562 METROPCS, INC. 920      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.